判断题

若制动片存在烧蚀、沟槽、裂纹等情况，要及时进行更换（）
正确
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答案：正确

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单项选择题

When may passengers smoke plane?
A、 You may smoke in Toilet.
B、You may smoke in your sea at any time.
C、 You may smoke once the signs at thefront of the cabin have been switched off.
D、 You may smoke once the signs at the front of the cabin havebeen switched on.