不符合收缩早期喷射音的是()
A.S1后0.05~0.07s
B.声音呈高频爆裂样
C.短促高调、清脆
D.主动脉瓣区、肺动脉瓣区皆可听到
E.见于正常青少年
参考答案:E
— Where did you find the coat?
— It was ____ the lecture hall ____ we held the English Competition. [ ]
A. in; that
B. /; where
C. /; that
D. in; where
在连接运算中,______连接是去掉重复属性的等值连接。