不合规格标准的总包邮件包括（）。
A、邮单数据错误
B、袋牌字迹模糊
C、袋身有02厘米裂口
D、包单不符
参考答案：B
一手电筒灯，正常工作电流是200mA，当它正常工作1min时通过灯丝的电量是 ，若用两节干电池串联作电源，电流所做的功是 。
What happened to businesses after the mass move
A．They established branches in suburbs.
B．They scattered here and there in cities.
C．Some bigger companies moved out.
D．They lost many employees.
