成年初期的年龄阶段为（）
A.18、19～35岁
B.35～60岁
C.60岁以后
D.30～50
参考答案：A
Do you know _____? [ ]
A. when did he start hiccupping
B. how far from school does she lire
C. which movies will win awards next year
D. whether has the No.15 bus arrived
合闸、分闸线圈在动作后为什么必须马上切断电源，是靠什么来切断电源 的？
