女性,48岁,原有风湿性心脏病联合瓣膜病变,10天来因发热、咳嗽、咯血住院,作哪项检查对诊断最有帮助().
A.血培养
B.心脏超声
C.胸部X线
D.血常规
E.心电图
参考答案:A
What my friend needs is ______ book, which contains _______ ABC of computers.
A, a; / B, the; / C, the; an D, a; the
一般用()来表征水库调节特性。
A.日调节
B.年调节
C.季年调节
D.月调节