心脏表面的冠状沟是（）
A.左、右心室分界标志
B.左、右心房分界标志
C.心室、心房分界标志
D.为心尖附近的环形沟
E.以上均错
参考答案：C
—Yesterday I lost my pencil sharpener. I couldn't find ________.
—Oh, it's a pity. You'd better buy ________ this afternoon. [ ]
A. it; it
B. it; one
C. one; it
D. one; one
一定条件下，下列反应中水蒸气含量随反应时间的变化趋势符合下图的是( )
A．c0(g)+H(g) F=e=CO(g)+H0(g)△H>0
B．CHCH0H(g) CH=CH(g)+H0(g)△H>0
C．2CHCHCH(g)+0(g) 2CHCH=CH(g)+2HO(g)△H<0
D．C0(g)+2NH(g) CO(NH)(s)+H0(g)△H<0
(g)+H
F=e=CO(g)+H
CH
H
CH