铜绿假单胞菌败血症（）
A．羧苄西林+庆大霉素
B．苯唑西林
C．青霉素G+磺胺嘧啶
D．红霉素
参考答案：A
Grover Cleveland was the first president ________in the White House.
A．got married
B．to get married
C．has got married
D．was married
CPU主要的性能指标是______。
A．发热量和冷却效率
B．可靠性
C．耗电量和效率
D．字长、运算速度和时钟主频
