For _______the power is supplied by main switchboard directl

【名词&注释】

人为因素(human factor)

[单选题]For _______the power is supplied by main switchboard directly not through sub-board

A. saving network cost
B. improving the reliability of supplying power to important load
C. preventing sequence reversing
D. increasing the power Factor of important load

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举一反三：

[单选题]满载水线以上水密空间所具有的浮力称为( )。

A. 满载浮力
B. 空载浮力
C. 理论浮力
D. 储备浮力

[单选题]人为因素造成直接或间接的船舶安全和污染事故占事故总量_______。

A. 90%
B. 80%
C. 70%
D. 60%

[单选题]下列哪项不是关节脱位的特有体征( )。

A. 肿胀和皮下瘀血
B. 畸形
C. 关节内空虚

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