油中乳化剂法又称（）。
A、湿胶法
B、干胶法
C、机械法
D、新生皂法
E、两相交替加入法
参考答案：B
师生关系在教学上是__________关系。
The reason he did not come was he was ill.
A．that; why
B．that; that
C．why; that
D．why; which
