It is important to use only pure lead and to choose a thickn

【名词&注释】

磨损率(wear rate)、螺旋桨(propeller)、环氧树脂(epoxy resin)、热喷涂(thermal spraying)、工作量(workload)、气缸套(cylinder liner)

[单选题]It is important to use only pure lead and to choose a thickness of wire which is greater than the normal allowable clearance but （） this amount.

A. not less than twice
B. greater at least twice than
C. not greater twice than
D. larger three times tha

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学习资料：

[单选题]衡量气缸套^{(cylinder liner)}内圆表面磨损的指标有（）。Ⅰ.椭圆度误差；Ⅱ.圆度误差；Ⅲ.圆柱度误差；Ⅳ.内径增量；Ⅴ.磨损率。

A. A．Ⅲ＋Ⅳ＋Ⅴ
B. B．Ⅰ＋Ⅱ＋Ⅴ
C. C．Ⅱ＋Ⅲ＋Ⅳ＋Ⅴ
D. D．Ⅱ＋Ⅲ＋Ⅳ?

[单选题]曲轴臂距差的符号表明曲轴（）。

A. 受力程度
B. 受力方向
C. 弯曲变形方向
D. 应力性质

[单选题]航行中船舶推进系统发生故障，为了准确地确定修理范围、修理项目、修理方案及其工作量^(workload)，修理前必须进行（）。

A. 拆卸
B. 各种检验
C. 各种测量
D. 零件无损探伤

[单选题]船轴工作轴颈磨损后可采取（）修复。

A. 光车
B. 热喷涂
C. 镀铬
D. 镀铁

[单选题]沿海及内河的船舶的螺旋桨直径D＜4.5m时，螺旋桨和艉轴允许采用（）方式连接。

A. 无键环氧树脂
B. 有键环氧树脂
C. 机械连接
D. 油压套合连接

[单选题]A heater in the circuit facilitates warning of the engine prior to （） by circulating hot water.

A. starting
B. stopping
C. to start
D. to sto

[单选题]The fine filters will be arranged （） one can be cleaned while the other is operating.

A. in order to
B. because of
C. so that
D. so as to

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