“x与3的差的3倍不小于4”用不等式表示为 ．
3(x-3)≥4
根据题意，得3(x-3)≥4
What ___________ he like ___________ lunch?[ ]
A. do; for
B. does; for
C. do; at
D. does; in
焊条电弧焊的电弧电压指（）之间的电压。
A.电弧两端
B.电压两端
C.电流两端
