船舶离心消防泵在使用时，喷枪出口压力可通过（）进行调解
A.泵吸入阀
B.泵的转速
C.泵出口阀
D.不可调节
参考答案：C
亚急性细菌性心内膜炎最常见的致病菌是（）
A.金黄色葡萄球菌
B.肺炎双球菌
C.肠球菌
D.草绿色链球菌
E.革兰氏阳性球菌
（山东省淄博市2009学年度高三二摸，35）Zhang Lin was addicted to computer games during his last year in high school , otherwise he ____________a student of Beijing University .
A．would have been
B．should be
C．has been
D．had been
