小儿喉腔最狭窄的部位是()。
A.环状软骨水平
B.声门裂
C.前庭裂
D.喉前庭
E.喉中间腔
参考答案:A
______ is particularly interested in the relationships between sentences and the contexts and situations in which they are used.
在2KBr+CI2=2KCI+Br2反应中,氧化剂是( )。
A.CI2
B.KBr
C.Br
D.cl