硝酸盐还原试验可产生氮气的细菌是（） A.大肠埃希菌 B.奇异变形杆菌 C.铜绿假单

已知集合A={1，2，3，x}，B={3，x²}，且A∪B={1，2，3，x}，则x的值为______．

ISDN 为了使通信网络内部的变化对终端用户是透明的，它必须提供一个标准的______。

A．用户接口

B．数据速率体系

C．网络接口

D．网络协议体系

句型转换。

1. Write out the story with the questions. (同义句)

    Write out the story _____ the questions.

    _____ the questions to write out the story.

2. Baghdad was not an important city anymore. (同义句)

    Baghdad was _____ _____ an important city.

3. Ali Baba's wife asked "Who are those men in the jars?"

    Ali Baba's wife asked who _____ _____ _____ _____ _____ _____?

4. Ali Baba's wife asked him" Are they your friends?"

    Ali Baba's wife asked him _____ _____ _____ _____ friends.

5. Ali said to his wife  "Sh, Be quiet!"

    Ali _____ his wife _____ _____ _____.

女性，32岁，反复发热在37℃～38℃左右1个月，伴关节肌肉酸痛就诊，体检：轻度贫血，心界不大，心率90次／分，心尖有收缩期吹风样杂音Ⅲ级，并有收缩中期喀喇音。诊断为风湿性心脏病，二尖瓣关闭不全，发热待查

最有助于诊断感染性心内膜炎的辅助检查是（）

A.胸部X线摄片

B.心电图

C.超声心动图

D.心血管造影

E.心脏CT

黏液血便，右下腹腊肠样包块，应首选的检查是（）

A.B超

B.CT

C.乙状结肠镜检查

D.胃肠钡餐透视

E.灌肠气钡双重造影