带电作业过程中，绝缘导线由于具有较高的绝缘水平，可以不进行绝缘遮蔽。（）
参考答案：错
下列选项中，构成流动资产的有（）。
A.现金
B.短期投资
C.应收账款和预付款项
D.各种存款和存货
E.专利权和商标权
-I joined the League _____ May 4th, 20ll. What about you
-I have been a League member ______ three years ago.
A．in; for
B．on; for .
C．in; since
D．on; since
