测定密度时，试样应（）量筒中。
A. 沿壁倾入
B. 用玻璃棒引流至
C. 快速倒入
在梁、板、柱等各种钢筋混凝土构件中都有配置承受拉力或压力的钢筋，被称为（）。
A. 架力筋
B. 受力筋
C. 分布筋
D. 箍筋
When lowering lifeboats in heavy seas，a good practice is to rig frapping lines（）.
A. on only the forward falls
B. on only the after falls
C. with a lead of about 45 degrees to the boat
D. from the falls to the main deck of the vessel
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