扒渣杆折断的主要原因是:在使用过程中不断碰击铁水包壁造成损坏。
参考答案:对
如图所示的电路中,电源电压为3V,当开关S1,S2都闭合时,则
A.电压表可能被烧坏
B.电流表将被烧坏
C.灯L1亮,灯L2不亮
D.两只灯泡都将被烧坏
People are always on the go , so they _____ spend their weekend on housework . [ ]
A. most
B. almost
C. mostly
D. nearly