快速射血期( )
A.房室瓣开放,半月瓣关闭
B.房室瓣关闭,半月瓣开放
C.房室瓣、半月瓣开放
D.房室瓣、半月瓣关闭
E.先半月瓣开放,然后房室瓣关闭
参考答案:B
句型转换。
1. Can you play the piano? (作否定回答)
______, I ______.
2. She wants to join the music club. (对画线部提问)
______ ______ ______ she______ to join?
3. The club can help kids with swimming.(改为一般疑问句)
______the club_____ kids with swimming.
4. June can draw.(对画线部分提问)
______ ______June______ ?
5. My sister wants to join the art club.(改为否定句)
My sister______ ______ to join the art club.
简述薪酬调查方式。