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【多选题】
焊缝布置的要求有______等。A.
焊缝应尽可能分散
B.
焊缝的位置应尽可能对称分布，以抵消焊接变形
C.
焊缝应尽可能避开最大应力和应力集中的位置
D.
焊缝应尽量避开机械加工表面，以防止破坏已加工面
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【简答题】什么是行车闭塞法?什么是基本闭塞法?什么是代用闭塞?
【单选题】The old man asked me ____
A.
where was the cinema
B.
where is the cinema
C.
where the cinema was
D.
where was the way to the cinem
【简答题】什么是行车闭塞法？行车闭塞法有几种？
【单选题】The old man asked me ________
A.
where was the cinema
B.
where is the cinema
C.
where the cinema was
D.
where was the way to the cinema
【单选题】The old man asked me___.
A.
where the cinema was
B.
where was the cinema
C.
where is the cinema
D.
where was the way to the cinema
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