There is a wide ________of reference books to be found, so ________you look for some material needed, you can turn to me.

A．kind; the last time

B．sort; every time

C．variety; next time

D．type; the moment

支柱负载计算一般以（）时为计算条件。

（A）最低温度

（B）最高温度

（C）最大风速

（D）最大覆冰