Present at the meeting                  ．

A．Mr. Liu was, who taught us English

B．was Mr. Liu, who taught us English

C．was who taught us English, Mr. Liu

D．Mr. Liu, who taught us English, was

患者男性，67岁，因先兆晕厥行颈动脉窦按摩检查。

颈动脉窦按摩的原理是（）.

A.提高迷走神经张力，减慢窦房冲动发放频率

B.提高迷走神经张力，缩短房室结传导时间

C.提高迷走神经张力，缩短房室结不应期

D.提高交感神经张力，缩短房室结传导时间

E.提高交感神经张力，减慢窦房冲动发放频率