水灭火器的适用范围是（）
A.任何类型的失火
B.电器失火
C.纸、木、布及织物等失火
D.油类物品失火
参考答案：C
He bought a book with the _____ 50 dollars and then his money _____.[ ]
A. remaining; ran out of
B. remaining; was used up
C. remained, ran out
D. remained, gave out
OSN3500设备主控板GSCC的PWRC灯变成红色代表（）意思。
A.A路-48V电源故障
B.B路-48V电源故障
C.A、B两路-48V电源故障
D.系统+3.3V备份电源丢失
