【简答题】上证成分股指数和上证A股指数都采用派许加权综合价格指数公式计算。( )
【判断题】If we don’t know the fact that the same word means differently in different contexts, communications will be hindered
【单选题】电压互感器二次熔断器熔断时间应( )。 ( A)小于1s; (B)小于0.5s; ( C)小于0.1s; (D)小于保护动作时间。
【判断题】If we don’t know the fact that the same word means differently in different contexts, communications will be hindered.A. √ B. ╳
【单选题】If we don’t know the receiver’s name, wo often use ________ in business letters.