电气设备的金属外壳凡因()可能带有危险电压者,必须可靠接地。
参考答案:绝缘损坏
___________child as she is,she find in____ surprise that she knows a lot of English words.
A.A;the
B.the ;the
C./;/
D.A;/
风湿热的发病年龄多见于()
A.5~15岁
B.3~18岁
C.4~16岁
D.1~15岁
E.2~14岁