血吸虫病的主要感染方式是
A．误食血吸虫卵B．食用钉螺C．接触毛蚴D．接触含尾蚴的疫水E．以上都不是
参考答案：D
—Could you please tell me something about the two _______?
—_______. They are exchange students of No. 1 Middle School. [ ]
A. Frenchmen; Yes, please
B. Frenchmans; Come on
C. Germen; Not at all
D. Germans; All right
表征焦炭热性质的指标是什么？影响焦炭热性质的因素主要有哪些？
