涂料在干燥过程中，通常可分为两个阶段，即表面干燥过程和实际干燥过程。( )
参考答案：对
.It is suggested that the students’ homework _______ in time.
A．be handed in
B．handed in
C．handing in
D．hand in
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
