对于斜拉桥，当采用对称断面并对桥下净空要求较大时，多采用（）.
A.单塔式
B.双塔式
C.多塔式
D.组合式
参考答案：B
She didn't think _________ she did wrong that day. [ ]
A. that
B. what
C. which
D. if
淀粉酶法测定粮食中淀粉含量的原理是什么？
