抄表时应穿工作服务，戴工作牌（证）。
参考答案：对
Mr White, who comes from _____ European country, has formed ____ habit of attending church on Sundays.
A．an; /
B．a; a
C．an; the
D．a; the
电容器三相间的容量应平衡，其误差不应超过一相总容量的（）
A.20/0
B.50/0
C.100/0
