25.After studying chemistry for years, I

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问题选择题

25.After studying chemistry for years, I can only say I have ___ general knowledge of this subject.

A．/

B．a little

C．a

D．Some

答案

答案：C

选择题

To promote sales businesses are trying every means to ______ the wholesale price of their products. [ ]

A. pull down

B. put down

C. set down

D. bring down

单项选择题

为保障人身安全，除专业人员外，任何人员所携带的物件（包括长杆、导线等）与接触网设备的带电部分需保持（）m以上的距离。

A.1

B.Z

C.3