电池放电时温度有何要求？
PMS中电容器组的绝缘介质、安装方式、额定电压、额定频率、单台容量、每相数量属于必填项。
P=U*I*cosΦ，P为（） 有功功率。 电压。 电流。 功率因数。
Risk of collision exists when an approaching vessel has a(n)（）. generally steady bearing and decreasing range。 generally steady range and increasing bearing。 increasing range and bearing。 decreasing bearing only。
In ships where the engine room is designed as UMS, temperature sensors are fitted at critical points within the scavenge spacesActivation would cause automatic （）of the engine. stop。 start。 speed up。 slow dow。
确认儿童玩具存在缺陷的，生产者的下列做法错误的是（）
