未含金属套、铠装的金塑小截面电缆水平敷设方式普通支架、吊架的允许跨距()。 ["400mm","600mm","800mm","1500mm"]
不属于网络支付的工具的有()。 ["银行卡","手机账户","虚拟账户","支票"]
观察事物的多样性和不确定性是() ["变异","变量","总体","样本","概率"]
应急照明集中电源应设主电和应急电源状态指示灯,其中主电状态用()。 ["红色","黄色","蓝色","绿色"]
下列不是损失数据收集的核心环节的是()。 ["损失事件识别","损失金额弥补","损失事件填报","损失数据收集验证"]
什么是“四无粮仓”和“四无油罐”?