正确答案: C
仅Ⅲ对
题目:假设某一中央冷却系统中设有三台循环水泵,船舶航行在温带水域若只要两台水泵正常工作就能满足冷却需要,则三台水泵从可靠性角度看就成为()。Ⅰ.并联系统;Ⅱ.串联系统;;Ⅲ.表决系统
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学习资料的答案和解析:
[单选题]在水平平面内,当曲柄的两个主轴承位置偏左,曲轴轴线呈左弧线弯曲(即呈“(”形)时,该曲柄的臂距差Δ-为()值。
负
[单选题]对使用液压撑杆螺栓的正置式主轴承,因其一端顶在轴承盖上,另一端顶在()上,所以在上紧贯穿螺栓之前,必须先()全部撑杆螺栓。
机架/松开
[单选题]Engine fuel pump index is ().
the reading at the rack
[单选题]Excessive clearances in the main or crank-pin bearings will sometimes be indicated by () before any bearing knock is heard.
loss of pressure in the lubricating system
[单选题]Lube oil pumps taking suction from the sump of most small marine engines are usually ().
of the positive displacement type