问题
选择题
He injured his leg and ______ couldn’t play in the game.[ ]
A. therefore
B. however
C. in which case
D. in this way
答案
答案：A
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He injured his leg and ______ couldn’t play in the game.[ ]
A. therefore
B. however
C. in which case
D. in this way
答案：A
的加速度做匀减速直线运动，若其着陆速度为
，则t=5s时的飞机位移为_____________和速度_____________；
后位移_____________