断路器最低跳闸电压，其值不低于（）额定电压。
A、20%
B、30%
C、40%
D、50%
参考答案：B
Whatever you have found，you should give it back to whomever it ________.
A．is belonged to
B．is belonging to
C．belonged to
D．belongs to
6～14岁小儿血红蛋白正常值的低限是
A．80g/LB．90g/LC．100g/LD．110g/LE．120g/L
