题目内容
Wear in parts of exhaust valve operation gear will tend to _______ the tappet clearance.
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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"
将下列段落翻译成汉语：Depending on the type of interrogation, the transponder sends back a transponder code (Mode A) or altitude information (Mode C) to help air traffic controllers to identify the aircraft and to maintain separation. Another mode called Mode S (Mode Select) is designed to help avoiding over-interrogation of the transponder (having many radars in busy areas) and to allow automatic collision avoidance.
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