问答题

下列属于灌注桩施工机械的是()。

A.振动锤打桩机
B.转盘式钻孔机
C.长螺旋钻孔机
D.旋挖钻机
E.潜水钻孔机

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An alarm device inserted between the deaerating tank and the expansion tank can notify the on-watching crew that .
A.the expansion tank is lack of water
B.the expansion tank is over flowing
C.there is something wrong with the cooling system
D.there is something wrong with the engine

A.
A.the
B.the
C.there
D.there

单项选择题

含碳量大于()为高碳钢。
A.0.50%
B.0.55%
C.0.60%
D.0.65%

A.0.50%
B.0.55%
C.0.60%
D.0.65%