冠心病患者出现心前区收缩期喀喇音及收缩晚期吹风样杂音,是由于()
A.心力衰竭
B.二尖瓣脱垂
C.二尖瓣相对性关闭不全
D.室间隔穿孔
E.心肌硬化
参考答案:B
---Can you tell me something about your school rules?
---Well, We are told ______anywhere. It’s our duty to keep our school clean and tidy.
A.not to make much noise
B.to draw
C.to throw waste paper
D.not to spit
商业秘密权利人的权利有______
A.控制权
B.使用权
C.转让权
D.处分权
E.署名权