男性，45岁，患十二指肠溃疡反复出血，行胃大部切除术，毕Ⅱ式，术后第三天诉右上腹剧痛

某9个月患儿，1个月前患麻疹已愈，近半月低热、咳嗽，疑结核病，OT1：2000试验阴性反应，下述哪项是正确的

A．可以排除结核病

B．可确诊为结核病

C．再作OT1:100试验

D．不能排除结核病

E．血培养加痰培养

男性患者69岁，缺失，7健康牙槽嵴丰满，口内余牙情况良好，7最宜用哪种卡环（）

A.回力卡

B.对半卡

C.联合卡

D.杆形卡

E.圈形卡

动词填空 。

1. Someone _____________ (knock) at the door, go and see who it is.

2. It is unnecessary for you _______________ (take) an umbrella every day.

3. __________ ( talk) with your parents often is a good way to make them understand you.

4. Hurry up! The film _______ (start) at 7;00 , there's little time left for us now.

5. Many people cut down trees __________ (make) more money.

6. We should protect animals to prevent them from _______________ (disappear).

三相电流型逆变电路的基本工作方式是（）导电方式。

A.30°

B.90°

C.120°

D.180°

B级钢铸造零部件焊接，立焊电流应比标准减少（）%。

A.4～11%

B.5～10%

C.6～9%