常用的混凝土喷射机是()。
A.罐缸式
B.螺旋输送式
C.转子式
D.混合式
参考答案:C
方程x2-8x=0的解是( )
A.x1=0 x2=8
B.x=8
C.x=0
D.无解
Last Thursday when I got to the airport, I ____I had left my ticket at home.
A.forgot
B.realized
C.believed
D.seemed