机电维修岗位电工，操作低压及电气设备主回路时必须使用的防护用品是什么？
参考答案：操作人员必须戴绝缘手套、穿绝缘鞋。
长江也是大河，为什么它没有凌汛？
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--- Look! That teacher is explaining something to her students again and again.
--- _________ teacher she is.
A．How patient
B．What a patient
C．How stubborn
D．What stubborn
