我国从（）代开始用铜锡合金铸造器物，称之为青铜器。
A.夏
B.商
C.周
D.秦
参考答案：A
— There ________a football match on TV tonight. I can’t wait to watch it.
— Me, too. It’s ________ Guangzhou Evergrande and the Australian team Melbourne Victory.
A．will be; between
B．will be; both
C．will have; between
D．will have; both
测量额定电压为1000V以下发电机定子绕组绝缘时，应用（）V兆欧表。
A.250
B.500
C.1000
D.2500
