R11制冷剂钢瓶的色标为()色。
A.黄
B.白
C.橙
D.紫
参考答案:C
You _____ cold if you had put on more clothes the day before yesterday.
A.won’t catch
B.wouldn’t have caught
C.hadn’t caught
D.haven’t caught
初级卫生保健又称()
A.基层卫生保健
B.低级卫生保健
C.农村卫生保健
D.一级卫生保健
E.综合卫生保健