心绞痛发作时可出现()
A.体温升高
B.血沉增快
C.血清心脏标记物升高
D.出现房性或室性过早搏动
E.四肢冰冷
参考答案:D
He would like ________ to go to the cinema with his brothers
A.go
B.going
C.to go
D.goes
在分析化学中,分离和富集有什么作用?