【正文】 （ 10 分） 2．畫出下圖所示梁的內(nèi)力圖（ 10 分）。將判斷結(jié)果填入括弧，以√表示正確，以 表示錯(cuò)誤） 1．約束是阻礙物體運(yùn)動(dòng)的限制物。2020 lear ning im plement t o t ube m ain leaders topic seminar spir it counselling m at er ial 2020 learning im plement o tube main leaders t opic seminar spir it counselling m aterial M arch 7, XI Gener al Secretar y t o Ipr ovince delegat ion par ticipate in considered and published has im port ant speech, on XXX pr ovince people for China r evolution victor y and Socialist const ruct ion made of contr ibut ion give has cert ainly, on Ipr ovince past f ive year s im plement at ion focus str at egy, and gr asp focus indust ry, economic social development made of result s give has cert ainly, Clarif ied the demands f or development of XXX, r ef er ring t o bot h dir ect ions, tasks and issues, t eaching met hods, for t he cur rent and f uture development in Heilongjiang pr ovince, is of gr eat pract ical signif icance and far reaching hist orical signif icance. Mar ch 22 to 24th, pr ovincial held has province t ube main leader s t opic seminar, pr ovincial Secr et ar y Wang Xiankui r ade in seminar opening pr ovince do has import ant speech, Wang Xiankui st r essed: in depth learning acquisiton Gener al Secretar y of speech, is on XXX a polit ical account , we m ust put lear ning im plement XI Gener al Secretar y im por tant speech spir it as major polit ical t ask, adapt ed and led economic development new nor mal, insisted to economic const ruction f or Cent er not shake, implement im plementat ion ew development concept, weaknesses, and swagger gr ams shor t, and yangchangbuduan, St imulate t he endogenous dynamics, f ormation eff ect of EMU, f ir m im plementation of the five planning, the development of key indust ries, open Dr agon River pr ehensive revitalization new journey, st ruggling t o get out of a high qualit y, ef ficient, bet ter st ruct ure and development r oad of r evit alizat ion of t he advantages int o f ul play. M ar ch 29 to 30th, t he Commit t ee anized a pi e major themat ic seminar of leading cadr es prefect ural rade J ia Yumei made an import ant speech at t he opening ceremony. J ia Shuj i str essed, f ul dist rict upper and lower must o ef f ect ive enhanced lear ning publicit y im plement implementation XI General Secr et ar y im port ant speech spir it of polit ical consciously, and t hought consciously, and action consciously and mission consciously, put lear ning XI General Secretary and pr ovincial Secr et ar y Wang Xiankui speech spir it as cur ent primar y polit ical t ask, t o m or e st rongly of att itude, and m or e powerf ul of m easur es, and more f ul of dr ive pr omot ed f orest t ransform at ion development, st ruggled t o ut of or est r ansformation development new, ensure as scheduled achieved f ul built f orest society of t arget. Today t he Count y f or convening t his Conference, is t o f uly im plement he ar rangement s of t he provincial, pref ectural, and is a m aj or polit ical t ask. Countywide each of t he part y members and cadres must earnest ly study, deeply under st and, enter into t he heart , done outside t he heart , of the line ar med wit h J ia, Secr et ar y of spir it and mind, practice, work, below, I XX pract ical st udy J ia Shuj i39。 ( ) 2．力沿坐標(biāo)軸方向上的分力是矢量，力在坐標(biāo)軸上的投影是代數(shù)量。 2020 lear ning im plement t o t ube m ain leaders topic seminar spir it counselling m at er ial 2020 learning im plement o tube main leaders t opic seminar spir it counselling m aterial M arch 7, XI Gener al Secretar y t o Ipr ovince delegat ion par ticipate in considered and published has im port ant speech, on XXX pr ovince people for China r evolution victor y and Socialist const ruct ion made of contr ibut ion give has cert ainly, on Ipr ovince past f ive year s im plement at ion focus str at egy, and gr asp focus indust ry, economic social development made of result s give has cert ainly, Clarif ied the demands f or development of XXX, r ef er ring t o bot h dir ect ions, tasks and issues, t eaching met hods, for t he cur rent and f uture development in Heilongjiang pr ovince, is of gr eat pract ical signif icance and far reaching hist orical signif icance. Mar ch 22 to 24th, pr ovincial held has province t ube main leader s t opic seminar, pr ovincial Secr et ar y Wang Xiankui r ade in seminar opening pr ovince do has import ant speech, Wang Xiankui st r essed: in depth learning acquisiton Gener al Secretar y of speech, is on XXX a polit ical account , we m ust put lear ning im plement XI Gener al Secretar y im por tant speech spir it as major polit ical t ask, adapt ed and led economic development new nor mal, insisted to economic const ruction f or Cent er not shake, implement im plementat ion ew development concept, weaknesses, and swager gr ams shor t, and yangchangbuduan, St imulate t he endogenous dynamics, f ormation eff ect of EMU, f ir m im plementation of the five planning, the development of key indust ries, open Dr agon River pr ehensive revitalization new journey, st ruggling t o get out of a high qualit y, ef ficient, bet ter st ruct ure and development r oad of r evit alizat ion of t he advantages int o f ul play. M ar ch 29 to 30th, t he Commit t ee anized a pi e major themat ic seminar of leading cadr es prefect ural rade J ia Yumei made an import ant speech at t he opening ceremony. J ia Shuj i str essed, f ul dist rict upper and lower must o ef f ect ive enhanced lear ning publicit y im plement implementation XI General Secr et ar y im port ant speech spir it of polit ical consciously, and t hought consciously, and action consciously and mission consciously, put lear ning XI General Secretary and pr ovincial Secr et ar y Wang Xiankui speech spir it as cur ent primar y polit ical t ask, t o m or e st rongly of att itude, and m or e powerf ul of m easur es, and more f ul of dr ive pr omot ed