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第1题

加工机座、箱体、支架等外形复杂的大型零件上直径较大的孔，特别是有位置精度要求的孔和孔系，应该采用（ ）。 选择一项： a. 钻孔 b. 铰孔 c. 磨孔 d. 镗孔
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第2题

穆勒认为，对幼稚产业的保护成本不能超过该产业将来利润的现值。
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第3题

10单选(2分) Most people usually traveled by ship and train which are driven by steam engine. It played an important part
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第4题

9单选(2分) Most people usually traveled by ship and train which are driven by steam engine. It played an important part
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