低压电气工作时,拆开的引线、断开的线头应采取()包裹等遮蔽措施。
参考答案:绝缘
Last Wednesday, I ____ at home after dinner. [ ]
A. did some reading
B. went for a walk
C. visited friends
D. went shopping
下列合同中,属于无名合同的是()。
A.借用合同
B.居间合同
C.建设工程合同
D.借款合同