与膀胱癌发病有关的是
A．联苯胺B．氯甲醚C．苯D．氯乙烯E．一氧化碳
参考答案：A
It was Tom as well as two of his classmates that _______ invited to the party.
A．was
B．were
C．has
D．have
气雾剂的组成不包括（）
A.药物与附加剂
B.阀门系统
C.喷雾剂
D.耐压容器
