期货公司必须为客户提供交易履约担保。( )
参考答案:错
解析: 期货交易一旦成交,结算机构就承担起保证每笔交易按期履约的全部责任。
主要经肝代谢的静脉全麻药有()
A.氯胺酮
B.丙泊酚
C.乙咪酯
D.地西泮和咪达唑仑
E.硫喷妥钠
We would have called a taxi yesterday if Harold ________ us a ride home.[ ]
A. didn't offer
B. wouldn't offer
C. hasn't offered
D. hadn't offered