为了检验螺旋桨的螺距，关键是应测量计算出（）螺距。

【名词&注释】

螺旋桨(propeller)、弯曲应力(bending stress)、增压器(turbocharger)、剪应力(shear stress)、工作条件(working condition)、关键是

[单选题]为了检验螺旋桨的螺距，关键是应测量计算出（）螺距。

A. 局部
B. 截面
C. 桨叶平均
D. 螺旋桨总平均

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学习资料：

[单选题]废气锅炉烟垢着火的热量主要传导给（），使锅炉系统不能正常工作，甚至损坏锅炉。

A. 循环水
B. 蒸汽
C. 废气
D. A+B+C

[单选题]增压器的轴承一般以（）端的轴承先损坏，因该处（）、工作条件^{(working condition)}差。

A. 压气/承受轴向推力
B. 压气/温度高
C. 涡轮/承受轴向推力
D. 涡轮/温度高

[单选题]The cooling water jacket is common to all the cylinders but there are often （） to ensure that each cylinder receives the right amount and flow of water.

A. dividing walls
B. divided walls
C. dividing liners
D. divided jacket

[单选题]The crankshaft receives and transmits the full working power of the engine and is subjected to fluctuating （）.

A. bending stresses弯曲应力
B. torsion stresses扭转应力
C. shear stresses剪应力
D. All of the above

[单选题]The hand steering is a method by which the motion of the rudder is controlled with （）.

A. a motor-driven steering wheel
B. a pneumatic steering wheel
C. a hand-driven steering wheel
D. an electric steering wheel

[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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