“自我实现人”假设主要是在( )的基础上提出的。
A．“胡萝卜加大棒”
B．“需要层次理论”
C．“X理论”
D．“Y理论”
参考答案：B
--I don’t know .
-- You can go and ask Jack.
A．when does the train leave
B．that we will plant trees or not
C．if she had come yesterday
D．what I should buy for him
大型床身刮削时应注意哪些问题？
