She has to help her mom ________ dinner today.[ ]
A. makes
B. making
C. made
D. make
答案:D
在下列这些药品中属于抗生素的是
A.碘酒
B.阿司匹林
C.青霉素
D.抗酸药
在什么情况下,可以不经许可断开有关设备的电源?