A is mounted on one end of the crankshaft. The device on the other end of the crankshaft is known as the .
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【简答题】The evidence for harmony may not be obvious in some families. But it seems that four out of five young people now get on well with their parents, which is the opposite of the popularly-held image of u...
【简答题】The evidence for harmony may not be obvious in some families. But it seems that four out of five young people now get on with their parents, which is the opposite of the popularly held image (印象) of u...