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There is supposed to be a safety ________ which makes it impossible for trains t
There is supposed to be a safety ________ which makes it impossible for trains t
游客
2023-09-06
28
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问题
There is supposed to be a safety ________ which makes it impossible for trains to collide.
选项
A、appliance
B、accessory
C、machine
D、mechanism
答案
D
解析
A. appliance器具,电器,(独立而能单独使用的)小装置;B.accessory附件,配件,零件;C.machine机器;D.mechanism(复杂的、作为大机器上一部分的)机械装置。从以上辨析可见,D是正确答案。句意为:应该有一种安全装置使火车不能相撞。
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