在2011年1月版海马《常用配件价目表》里，欢动助力泵皮带为（）元/件A.16 B.

乙型肝炎感染后，最常见的临床类型是（）

A.慢性重型肝炎

B.急性无黄疸性肝炎

C.急性黄疸性肝炎

D.隐性感染

E.慢性肝炎

阅读理解。

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1. The best title of the 3rd advertisement would be _____.

A. Training at Home

B. Learning at Home

C. Recording Work

D. Working at Home

2. According to the information above, if your child has hearing problems, you can turn to _____.

A. At-Home Profession Corp.

B. Globe Insurance Company

C. Bradford Publications

D. American Inventors Corp58．

3. From the advertisements above, we can learn that _____.

A. Globe Insurance Company has a history of 51 years

B. as a medical transcriptionist, you may earn＄25,000 a month

C. Bradford Publications offers a treatment to hearing impaired parents

D. you can visit www.aic.com when you invent a new model of hearing aid

男，28岁，预激综合征病史3年，1小时前突感心悸来急诊室。ECG示预激综合征并阵发室上速，静注维拉帕米，终止发作。该药的作用机制最可能的是下列哪一项（）。

A.延长房室结不应期

B.缩短旁路不应期

C.延长旁路不应期

D.缩短房室结不应期

E.抑制心肌的兴奋性

某矩形截面简支梁。b×h=200min×500mm，混凝土强度等级为C20，箍筋采用双肢直径为8mm，间距为200mm的HPB235级钢筋，该梁斜截面破坏时为（）。

A.斜拉破坏 

B.剪压破坏 

C.斜压破坏 

D.界限破坏

凡是总体参数q的无偏估计量都是q的有效估计量。