直流电瓶汇流条如何供电：
A、直流汇流条 1 或电瓶
B、直流汇流条 1，直流汇流条 2 或电瓶
C、直流汇流条 2 或电瓶
D、不确定
参考答案：B
It's time for class.We'd better go to our classroom as ______ as we can. [ ]
A. slowly
B. quickly
C. quietly
D. easily
养慎
