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单项选择题
梯段相邻踏步高差应不大于每踏步两端宽度差不大于( )mm。
A.10
B.12
C.15
D.20
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单项选择题
向上运动时,b点 ( )
A.经过平衡位置向上运动
B.处于平衡位置上方位移最大处
C.经过平衡位置向下运动
D.处于平衡位置下方位移最大处
单项选择题
The narrator's friend strongly advise him never to drive across through the desert because __________. A.
He was not good at driving. B.
His car would surely break down in the desert. C.
It would be very dangerous if he met a Bushman. D.
There was no water in the desert.
单项选择题
A.24
B.32
C.48
D.64
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