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问题
判断题
方轴两端各装着一个光轮,其主要作用是拉紧轨板。
答案
参考答案:错
选择题
_____, the great mother, in order to save her sick child, kept waiting for four hours in the heavy snow.
A. It depends
B. Take it easy
C. Believe it or not
D. It is OK
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选择题
蝗虫身体表面坚硬的部分称做[ ]
A.中胶层
B.外骨骼
C.角质层
D.头胸甲
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