_____ there a map and two posters on the wall? [ ]
A. Have
B. Has
C. Is
D. Are
答案:C
坡道的常用坡度一般为( )。
A.8%~15%
B.10%~12%
C.12%
D.15%
A320机型最大起飞重量是多少kg()
A.75900
B.75500
C.72500