采用氩弧焊打底，单面焊双面成形的对接焊焊接接头，经100%无损探

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问题判断题

采用氩弧焊打底，单面焊双面成形的对接焊焊接接头，经100%无损探伤检测，焊接接头系数取φ=1.00。

答案

参考答案：对

选择题

Discovered by the Portuguese in 1506 and _____ in 1810, the island belongs to the Great Britain and has a population of a few hundred.

A．settling

B．settled

C．to settle

D．having settled

判断题

煤层顶板冒落带，导水裂隙带范围内分布有富含水层，必须进行疏降开采。