用一批纸装订同样大小的练习本,如果每本30页,可装订120本。现用这批纸装订100本,每本应该装订多少页?(用比例解答)
解:设每本应该装订x页。
30×120=100x
x=36
The man preferred ______ in the room to read to ______out for a walk.
A.staying, go
B.to go, going
C.staying, going
D.to stay, going
下列选项中,不属于空调系统按空气处理设备的集中程度划分的是( )空调系统。
A.集中式B.直流式C.分散式D.半集中式