Emulsion oils and sodium nitrite are both approved additives

【名词&注释】

螺旋桨(propeller)

[单选题]Emulsion oils and sodium nitrite are both approved additives, but the latter cannot be used if any pipes are （） or if any soldered joints exit.

A. chromed
B. welded
C. galvanized
D. bolted

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学习资料：

[单选题]为了检验螺旋桨的螺距应计算出（）。Ⅰ.局部螺距；Ⅱ.螺旋桨总螺距；Ⅲ.截面螺距；Ⅳ.桨叶平均螺距；Ⅴ.螺旋桨总平均螺距。

A. Ⅰ＋Ⅱ
B. Ⅰ＋Ⅲ＋Ⅳ＋Ⅴ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ

[单选题]舵杆常见的失效形式中不包括（）。

A. 轴颈磨损
B. 表面腐蚀与裂纹
C. 变形
D. 折断

[单选题]An aluminum piston has lower inertia and higher coefficient of （） compared to that of cast iron.

A. viscosity
B. twisting moments
C. inertia
D. thermal expansio

[单选题]VIT means （）

A. variable injection timing
B. variable inlet tonnage
C. vertical incoming tonnage
D. vertical inlet tank

[单选题]A crankshaft whose center of gravity coincides with its center line is said to be （）.

A. dynamically balanced
B. statically balanced
C. counter balanced
D. resonantly balanced

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