—What's this _______ English?
—It's a telephone. [ ]
A. in
B. from
C. to
答案：A
风湿性心内膜炎最常受累的瓣膜是
A．二尖瓣
B．三尖瓣
C．主动脉瓣
D．三尖瓣和肺动脉瓣
E．肺动脉瓣
阐述WCDMA系统中OMC的组成及功能。
