下列物质含有机物的是[ ]
A.金刚石
B.纯碱
C.干冰
D.酒精
答案:D
—Would you mind _______ your bike?
—Sorry. I'll do it right away. [ ]
A. to move
B. to make
C. moving
D. making
用万用表测量电流,档位选择应尽量使指针指在(),此时测量结果较准确。
A.中间附近
B.2/3以上区域
C.2/3以下区域
D.1/3以上区域