-______ do you like spring?
-Because it's warm.[ ]
A. When
B. What time
C. Why
答案:C
()对人类本性持既善又恶的观点。
张拉预应力筋可单根,也可多根成组同时进行,单根进行时应先调整预应力筋的初应力,以保证张拉完毕应力一致。( )