最常见的阵发性室上速的类型是()
A.房内折返性心动过速
B.窦房折返性心动过速
C.房室折返性心动过速
D.房室结内折性心动过速
E.以上都不是
参考答案:D
—Where is Sally?
—I’m not sure. She in the library.
A.might
B.must
C.will be
D.may be
影响湿润的因素有那些?