对闭路电视电源有何要求？
参考答案：
应配有不间断电源和保持连续工作24小时以上的备用电源
________left before the deadline, it doesn't seem likely that John will finish the job.
A．Though such a short time
B．Because such a short time
C．With such a short time
D．As such a short time
滴照是（）分析的其中一种分析方法。
A、荧光
B、系列对比
C、毛细
D、钻井液
