军政主官不得同时调整,出现空缺要随缺随补,空缺时间不得超过()个月。
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In moderate wind and current what should be the length of chain with a single anchor?()
A. 5 times the depth of the water in good holding ground
B. 10 times the depth of the water in shallow water
C. 2 times the depth of the water in poor holding ground
D. 8 times the depth of the water in deep water
有一物体重1.5t,用2根千斤绳起吊,千斤绳与铅垂线间的夹角为15°,试求每根钢丝绳承受的拉力?(夹角为15°时系数K取1.035)
在靠近泵进口处的吸入管上,应考虑安装()。
A. 底阀
B. 过滤器
C. 放空管
D. 安全阀