磨光是指对管模()进行修磨。
参考答案:内孔通身
下列图标与燃烧有关的是( )
A.
B.
C.
D.
––Tom is ill. He is now.
–– I’m sorry to hear that. Let’s go to to see him.
A.in the hospital; a hospital
B.in hospital; a hospital
C.in the hospital; the hospital
D.in hospital; the hospital