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28.?????????????AB??(3?)
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1.??????????????? ? ?A ??????????????? B ????????????? C ??????????????? D ???????????????? 2. ???????????????
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D?1?2 km/s
8????????????????? ? ?
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C.??????????????D.????????????? 9.??????????????? ???????? A.???????? B.?????????60? C.?BC?,???????? D.2min??????????
10.????????????????????????? ??
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12.??????????????????????????????????????? ???????????? ?? A.???????????????? B.???????????????? C.??????????????????? D.????????????????
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17. ????A????__________cm?
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26.??????????????????????????????????????????????????__________?.???
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18.???????????170???????50 ? ??????????___ _____________???????
19.????????????????????????????????????????????????_____????????____?????????????
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22.????????????????????????????????????? ????????????????????
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C?3.8108km D?3.8108km2
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10????????????????????????_______???????????????????_______???
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2? ?????????????(???)??????????????????????????????????????????????????????????????????_______??????
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2170m=340m/s*t
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发表于 2019-9-13 23:46:11