人工挖孔桩护壁混凝土强度等级应低于桩身混凝土强度一个等级,并应振捣密实。
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具有明显的主动运动能力的水生生物群落是:()
A. 浮游生物
B. 底栖生物
C. 自游生物
D. 漂浮植物
On the fully containerized ship,approximately one-third or more of the cargo is on deck above the rolling center. Top stowed containers are subject to().
A. accelerations greater than on conventional vessels
B. accelerations less than on conventional vessels
C. accelerations the same as on conventional vessels
D. no acceleratio
钢轨探伤仪采用多探头法进行探伤,主要是为了提高探伤速度。
A. 正确
B. 错误
广泛用于扑救城乡、山林、草原火灾的常用灭火剂有()。
A. 汽油
B. 柴油
C. 水
D. 冰