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???2014???????
2014????
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2014????
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17?????????????????????????????80-100??5??
2014????
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5. ?2014???????5?2???????????3 cm,5
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11.?2014???????11?2?????=30,????????, sin????
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12. ?2014???????12?2??????????3cm,???????2?
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21.?2014???????21?8?????????????3??,?????????1,2,3,??????????????.
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24. ?2014???????24?7??????????xOy?,??,??Rt?DOE,?DOE=90,OD=3,?D?y??,?E?x??,??ABC?,?A,C?x??,AC=5. ?ACB+?ODE=180, ?ABC=?OED,BC=DE.???????????????:
?1???ODE?O?????????90???OMN????D??????M,?E??????N?,???OMN;
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1?????8??????100???????90?????????????????????????
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3???????2B???????????????????????????????????????????????0.5??????????????????????????????? 4???????2B?????????????
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0.8103kg/m
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1
F1?
F2 = 5
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10????????????????????????????????
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A??????????????????????? B??????????????????????? C??????????????????????? D???????????????????????
11??????????????20N????????????????????????10N???
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A?????????????10N??????1m B?????????????20N??????2m C?????????????10N??????2.4m D?????????????20N??????4.8m
12????????????????R1??????R2?????????????????????
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17????????????????425N???????4m??????250N????20s????
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18?????????????R1 = 2??R2 = 3??R3 = 4?????S????A1?A2????? ____________?
???V1?V2????? _________????S1?S2????A1?A2????? ____________????V1?V2????? _________? 19?????????????????????????????????
???????8m2?????????????????????????????????????1000J????????????120V??????????????10A?
?1??????_________????????????? ?2??????????????????? ____________?
?3?????????????????? _______ ????????80%??????????
????????????150N???????????? ______m/s?
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S
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?1??????????????? ________ C?
?2???????????????A??????VA????B??????VB???VA _______VB
???>?=?<????????A?B????????????pA?pB??pA ______
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?????????????????????????? _______ C?
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3?????????????????????????
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发表于 2019-9-13 23:46:11