只要使氯化钠溶液的凝固点比（）低5～8℃即可满足要求。 ["蒸发温度","冷凝温度","过冷温度","排气温度"]
逻辑运算1001U1011=（）。 ["1001","1011","1101","1100"]
机载自动定向仪中的环形天线具有什么特性：（）. ["单值性","相位叠加","无方向性","方向性"]
氯化钠水溶液的共晶温度为（）℃。 ["-5.2","-10.2","-15.2","-21.2"]
二进制数1011十1001＝（）。 ["10l00","1010l","11010","10010"]
手机辐射对胎儿的影响有哪些？
