题目内容

If we ____ adequate preparations, the conference wouldn't have been so successful.

A. haven't made
B. wouldn't make
C. didn't make
D. hadn't made

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交叉钢筋的焊接应用()方法。

A. 闪光对焊
B. 电弧焊
C. 电渣压力焊
D. 电阻点焊

电渣压力焊工艺工程为：电弧引燃过程、_ _、__ _、加压焊接过程。

钢筋的连接方法有绑扎连接、_和_等三种方法。

地轴进动的表现？