对压力容器的日常维护，主要内容有（）
A、检查压力
B、检查流量
C、检查外部
D、检查温度
参考答案：A, C, D
— Football by the British at the beginning of last century.
— That's probably why football is one of popular games in England. [ ]
A. was invented, the most
B. invented, more
C. was invented, more
D. invented, the most
电流互感器运行时，常把两个二次绕组串联使用，此时电流变比将减小。（）
