单项选择题

盘盖类零件的机加工方式主要以（ ）为主。
A、铣削
B、车削
C、铸造
D、刨削

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_____________ more difficult for grown-ups to learn a foreign language. A. There seems that B. That seemed to be C. They seem to be D. It seems to be
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人才穿裤子，到了汉代，汉昭帝时才把有裆的裤叫做“裤”。
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