【判断题】Increased demand for a country's exports causes its currency to depreciate.
【单选题】The second paragraph tells us that the increased demand for electricity today .
A.
has led to the decrease in supplies of oil
B.
means that more countries are interested in nuclear power
C.
has increased the risk of accidental explosions
D.
has increased the very means of producing more atomic bombs
【简答题】有害物质的检查包括哪些内容 ( ) A.有机氯、有机磷农药残留量 B.重金属 C.黄曲霉毒素 D.砷盐A. 1 B. 1 C. 1 D. 1
【单选题】从制造角度考虑,低压电器是指在交流50Hz、额定电压()V或直流额定电压1500V及以下电气设备。(0分)
【单选题】额定电压交流( )kV及以下的应为低压电器设备.器具和材料。