测量螺旋桨桨叶上的螺距时，依螺距规水平杆的转角α和量杆的升程Δ

【名词&注释】

螺旋桨桨叶(propeller blades)

[单选题]测量螺旋桨桨叶上的螺距时，依螺距规水平杆的转角α和量杆的升程ΔL可计算出（）。

A. 局部螺距
B. 截面螺距
C. 桨叶螺距
D. 总平均螺距

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学习资料：

[单选题]Before "stand-by" is rung on the engine telegraph, it is usual to give the main engine （） ahead and astern.

A. a brief trial with turning gear
B. a brief trial on power
C. a long trial by steering gear
D. one minutes trial with windla

[单选题]For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.

A. cylinder casing
B. cylinder bore
C. crankcase door
D. aperture in the cylinder block

[单选题]In a four-stroke engine the camshaft rotates at （）.

A. half the engine speed
B. twice the engine speed
C. the engine speed
D. four times the engine speed

[单选题]Smaller engines can be made more rigid than large ones and may not have （）.

A. through bolts
B. dividing walls
C. sloping surfaces
D. relative angle

[单选题]High firing pressures and a low exhaust temperature in a diesel engine may result from （）.

A. decreased piston to cylinder head clearance
B. increased exhaust system back pressure
C. early fuel injection timing
D. low scavenge air temperature

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