社会主义制度下个人消费品分配的基本原则是 [ ]
A．按劳动力分配
B．按劳分配
C．按酬付劳
D．按生产要素分配
答案：B
Is _______ Qinghai-Tibet Railway plays an important role in China's railway history the topic that you are coming to? [ ]
A. what
B. it
C. this
D. that
图中所示硬脊膜穿破后的头痛的发生原理，请问其发生率约为（）。
A.10%
B.11%～19%
C.20%～29%
D.30%～76%
E.80%
