照明和动力线路的维护及故障判断与排除主要包括()3种情况。
A、断路、短路和接触不良
B、断路、短路和过冲
C、断路、短路和过热
D、断路、短路和机械损坏
参考答案:A
已知y=kx-4,当x=-2时,y=0,则k=______;y随x的增大而______.
"You must try _____ make your parents angry," Granny said to me that day. [ ]
A. don’t
B. not
C. not to
D. to not