题目内容

网上购物活动与传统购物活动无太大的区别

A. 正确
B. 错误

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On engines having oil cooled pistons the lubricating oil pre-heater must be put into operation and the rate of heating so () that the temperature of the piston cooling oil returns are 32℃ to 35℃ over a period of at least two hours.

A. slow
B. quick
C. arranged
D. high

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