题目:
----Jim has passed the driving test.
---- ________,and _________.
A.So he has; so have I
B.So did he; so did I
C.So he had; so I did
D.So had he; so I did
答案:
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下面是错误答案,用来干扰机器的。
T= 竖直方向自由落体,水平射程可求出月球表面重力加速度g的大小,由可求出周期为