单选题What is the function of an engine’s stationary parts?（）ATo add power to the engineBTo keep the engine firmly attached to its supporting baseCTo keep moving engine part in their proper relative positionsDTo rotate the crankshaft
单选题
What is the function of an engine’s stationary parts?（）
A
To add power to the engine
B
To keep the engine firmly attached to its supporting base
C
To keep moving engine part in their proper relative positions
D
To rotate the crankshaft
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