普通旅客列车主要工种乘务员应具有高中（中专、中技）以上文化程度，经考试合格后方可任职。
参考答案：对
---_______ do you watch TV?
---Only once on Saturday evening. You know as a student I am too busy.
A．How much
B．How long
C．How soon
D．How often
哪一种修复体主要依靠邻沟固位
A．半冠B．嵌体C．锤造全冠D．铸造金属全冠E．3/4冠
