钻孔灌注桩的水下混凝土的含砂率宜为( )。A．20%～30% B．30%～40%

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问题单项选择题

钻孔灌注桩的水下混凝土的含砂率宜为( )。

A．20%～30%

B．30%～40%

C．40%～50%

D．50%～60%

答案

参考答案：C

单项选择题

Which of the following nursing interventions is most important postoperatively for an infant who has received a ventriculoperitoneal shunt

A．Monitoring intake and output.

B．Initiating oral feedings.

C．Allowing the infant to rest undisturbed.

D．Providing age-appropriate diversionary activities.

单项选择题

平版胶印机为了得到印版滚筒、橡皮滚筒和压印滚筒间无滑移的滚压状态，三滚筒的包衬半径关系一般为（）。

A、R印=R橡>R压=R节；

B、R印>R橡=R压=R节；

C、R印>R压>R橡=R节；

D、R印=R压>R橡=R节