题目内容
In some of the cylinders are not firing, the ones affected may be determined by watching _____________.
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Wear in parts of exhaust valve operation gear will tend to _______ the tappet clearance.
Wear in a cylinder liner is usually due to ___________.
The crankshaft should be turned by means of ____ to see that all parts move freely.
将下列段落翻译成汉语：A transponder is an electronic device that produces a response when it receives a radio-frequency interrogation. In aviation, aircraft have transponders to assist in identifying them on radar and on other aircraft's collision avoidance systems. Air traffic control units use the term "squawk" when they are assigning an aircraft a transponder code, e.g. "Squawk 7421". Squawk or squawking thus can be said to mean "select transponder code" or "I have selected transponder code xxxx"
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