变压器位于爆炸危险环境10区时，应选择()产品。
A．隔爆、正压增安型
B．增安型
C．尘密、正压防爆型
D．尘密、正压防爆充油防爆型
参考答案：D
I don’t know________.
Because he has to look after his mother.
A．why he is leaving
B．why is he leaving
C．whether he is leaving
D．whether is he leaving
原醛的肾素、血管紧张素Ⅱ和醛固酮的变化特点是（）
A.醛固酮高而肾素、血管紧张素Ⅱ正常
B.醛固酮高而肾素、血管紧张素Ⅱ低
C.醛固酮、肾素、血管紧张素Ⅱ都高
D.醛固酮与肾素高而血管紧张素Ⅱ正常
E.醛固酮与肾素高而血管紧张素Ⅱ低
