亚急性感染性心内膜炎抗生素治疗首选
A.红霉素
B.青霉素
C.庆大霉素
D.先锋霉素
E.新型青霉素
参考答案:B
--- She joined a football team last fall and was recently made captain.
--- Never _____ she’d ever have that much energy.[ ]
A. I had thought
B. I would have thought
C. could I have thought
D. will I have thought
关于期货合约的标准化的意义,下列描述中,正确的有()。
A.降低了交易成本
B.使期货市场具有很强的流动性
C.因转让无须背书,便利了期货合约的连续买卖
D.极大地简化了交易过程,便利了投机活动的进行