不易使原料均匀受热的传热介质是（）。
A、水
B、水蒸气
C、食用油
D、盐粒
参考答案：D
The suggestion we should have a discussion on this problem is not the one ________he made. [ ]
A. that, /
B. /, which
C. which, that
D. which, /
已知﹣25a2mb和7b3﹣na4是同类项，则m+n的值是[ ]
A．2
B．3
C．4
D．6
