下列何种化学物可致肝血管肉瘤
A．丙烯单体B．乙烯单体C．苯乙烯单体D．氯乙烯单体E．丙烯腈单体
参考答案：D
---I’m terribly sorry to have put you to so much trouble.
---______. You didn’t mean to, did you?
a. forget it b. no trouble c. all right d. you’re welcome
一辆小汽车4小时能行驶312千米．照这样的速度，小汽车12小时能行驶多少千米？．
