判断题

地球上大洋地壳的年龄要比大陆地壳古老的多

答案: 错误
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问答题

The cutting conditions in machining with NC machines usually refer to those variables that are changed by the part programmer

答案: 使用数控机床加工时的切削状况通常是指由零件编程员所改变的那些变量。
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