High-speed rotating in a centrifugal purifier can produce a

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标准时(standard time)

[单选题]High-speed rotating in a centrifugal purifier can produce a force （） larger than the force of gravity.

A. many thousand times
B. between times
C. one time
D. at time

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[单选题]在偶然故障期内，故障是否发生，是（）。

A. 可以预测
B. 可以防止
C. 可理论计算
D. 无法预测

[单选题]目前钢质海船建造时安装的轴系广泛采用（）。

A. 直线校中
B. 按轴承允许负荷校中
C. 合理校中
D. A或B或C

[单选题]当铁梨木艉轴承的轴承间隙和铁梨木板条厚度均不合标准时，应采用（）修理。

A. A．换新铜套
B. B．换轴承
C. C．换下瓦
D. D．换艉轴

[单选题]铁梨木艉轴承的缺点是（）和（）等。

A. 价格贵/来源少
B. 水润滑/轴包铜套
C. 价格贵/不耐磨
D. 不耐磨/易干裂

[单选题]Increasing the temperature of a fuel will reduce its （）.

A. viscosity
B. pressure
C. resistance
D. setting point

[单选题]The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.

A. suction
B. compression
C. expansion
D. exhaust

[单选题]The main factor which determines the output of each cylinder is （）

A. the cylinder weight
B. the cylinder bore
C. the cylinder length
D. the cylinder cover

[单选题]One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.

A. casting interlocking components
B. welding plates to form sections for assembly
C. forging integral components
D. case hardening integral component

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