正确答案: C

galvanized

题目：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.

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学习资料的答案和解析：

[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。

Ⅰ＋Ⅲ＋Ⅳ＋Ⅴ

[单选题]舵杆常见的失效形式中不包括（）。

折断

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

thermal expansio

[单选题]VIT means （）

variable injection timing

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

statically balanced