变位齿轮与标准齿轮相比较，其m、z和a都（）。
A．增大
B．不变
C．变小
参考答案：B
With the electricity _____ because of the road repairs,the whole building was completely dark. [ ]
A. cut up
B. cut off
C. cut out
D. cut down
台湾的言情片主要改编自琼瑶的小说。
