在常压沸点下，单位质量油品由液态转化为同温度下的气态油品所需要的热量称为油品的（）。
A.比热容
B.热焓
C.汽化潜热
D.功率
参考答案：C
某人排出的尿中含2%的尿素[CO（NH2）2]，如不考虑其他成分，则人尿中氮的质量分数约为（ ）
A．2%
B．9.3%
C．0.93%
D．0.8%
The children were warned of not being too_________about things they are not supposed to know.
A．strange
B．amusing
C．curious
D．satisfied
