电务人员在上道进行设备巡视（）等作业时，必须执行上道授权制度。
A.检查
B.检修
C.施工
D.故障处理
参考答案：A, B, C, D
（a+b） ×c = a×c+b×c应用了[ ]
A．乘法交换律
B．乘法结合律
C．乘法分配律
听句子，缩写原文。（）
A．Insurance is unnecessary for the transportation of goods.
B．Insurance is a factor that affects the price of goods.
C．Insurance contributes to reducing the price of goods.
D．Insurance helps improve the quality of goods.
