联苯胺主要职业危害是引起()。
A.膀胱癌
B.白血病
C.肺癌
D.皮肤癌
E.肝癌
参考答案:A
He told us that he ______ the letters in the morning.[ ]
A. will post
B. have posted
C. was posting
D. had posted
根据《票据法》的规定,付款人承兑汇票,不得附有条件,承兑附有条件的,所附条件不具备票据上的效力。( )