妊娠剧吐多见于年轻初产妇，常引起代谢性酸中毒。
参考答案：对
Don't expect to make much profit ________ the first couple of months setting up a company. [ ]
A. about
B. on
C. within
D. to
暖气包不提高水温，只加大水的流速，（）增加传热量。
A.能
B.有可能
C.不可能
D.无法确定
