正确答案: B

form

题目：Additives （） protective layers on metal surfaces guarding them against corrosion.

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学习资料的答案和解析：

[单选题]气缸套内圆表面采用（）加工，是防止拉缸事故的工艺措施之一。Ⅰ.珩磨；Ⅱ.振动；Ⅲ.机械；Ⅳ.波纹；Ⅴ.磨削。

Ⅰ＋Ⅱ＋Ⅳ

[单选题]涡轮壳体局部腐蚀较重，可采用（）修理。

焊补

[单选题]确定轴系理论中心线的方法有（）。Ⅰ.拉线法；Ⅱ.平轴法；Ⅲ.指针法；Ⅳ.直尺-塞尺法；Ⅴ.光学仪器法。

Ⅰ＋Ⅴ

[单选题]滑油系统的备车准备工作应检查（）。Ⅰ.循环油柜油位；Ⅱ.轴承油位；Ⅲ.储油柜油位；Ⅳ.分油机

Ⅰ+Ⅱ

[单选题]燃油系统的准备工作应检查（）。Ⅰ.柴油日用油柜油位；Ⅱ.重油日用油柜油位；Ⅲ.油舱油位；Ⅳ.柴油日用油柜加热；Ⅴ.重油日用油柜加热；Ⅵ.调整低压输送泵压力

BⅠ+Ⅱ+Ⅳ+Ⅴ

[单选题]For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.

crankcase door

[单选题]The gas loads on the engine structure are constrained by means of hydraulically preloaded （） which connect the bed plate, frame sections and cylinder jackets into a single unit.

tie rod