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单项选择题
调节弹簧的预压缩量,可调节溢流阀的调定压力。
A、正确
B、错误
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废石的排弃工艺因矿床的开采工艺、排土场的地形、水文地质特征及所排弃废石的物理力学特征而异。
答案:
正确
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Which of the following sentences best focuses on the audience? ( )
A.We are very pleased to have you as our newest customer.
B.You can help us by sending us your payment immediately.
C.Register now to lock in your preferred travel dates.
D.All sentences are focused on the audience rather than the sender.
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