正确答案: A

局部螺距

题目：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（）。

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学习资料的答案和解析：

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

a brief trial on power

[单选题]For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.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]In a four-stroke engine the camshaft rotates at （）.

half the engine speed

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

through bolts

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

early fuel injection timing