正确答案: D

D．改变防蚀衬套轴向位置

题目：艉轴防蚀衬套磨损后，除采用光车修复外，还可采用（）。

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学习资料的答案和解析：

[单选题]YJ17/YJ19卷烟机上主要采用的带传动有三角带、（）、圆形带、平带等。

同步齿形带

[单选题]桨叶上A区位于桨叶压力面0.4R以内范围，该区域内的缺陷一般不允许（）修理。

焊补

[单选题]The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.

such a height

[单选题]The shells are secured by means of bearing caps and studs, the necessary clearance being provided by means of （） of different thickness.

shims

[单选题]This used piston had been tested and approved as a spare part by the （） during last annual repair.

surveyor

[单选题]For Vee-form engines, （） is shaped to given two slopping surface on which （） are placed at the correct relative angle to each other.

the top of the column；the cylinder blocks

[单选题]An electric heater built into some smaller diesel engines is used to （）.

increase jacket water temperature for easier starting in cold weather

[单选题]A Kort nozzle is a(n)（）.

hollow tube surrounding the propeller used to improve thrust

[单选题]如果细胞甲比细胞乙的RNA含量多，可能的结果是（）

甲合成的蛋白质比乙多