当套管偏心度大于（）%时，水泥浆必然出现窜槽现象。A.30 B.40 C.50 D._爱下问搜题

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问题单项选择题

当套管偏心度大于（）%时，水泥浆必然出现窜槽现象。

A.30

B.40

C.50

D.60

答案

参考答案：D

选择题

24．As most of their houses were badly damaged after the earthquake, many people had to be_____in a stadium．

A．put away

B．put up

C．put out

D．put off

问答题简答题

骨折手法复位的原则是什么？