芳烃纯度低或非芳烃串入芳烃，会影响苯冰点和初馏点不合格。
参考答案：对
—You're late again. Do you have anything to say for yourself?
—______ except sorry. [ ]
A. Something
B. Nothing
C. Anything
哪项不是青春期性教育内容
A．性生理B．性病理C．性心理D．性道德E．性行为
