远程授权应遵循（）的基本要求。
A.全面
B.及时
C.连续
D.完整
参考答案：A, B, C
如图所示为一交变电流的电流图象，该电流的有效值为______A．
I bought a washing-machine and asked to have it sent to my house. The manager of the store promised to make a prompt（）
A.delivery
B.relay
C.supply
D.transport
