除借用对向车道通行的高速公路养护作业外，工作区的最大长度不宜超过（）km。
A、1
B、2
C、3
D、4
参考答案：D
— I didn’ t expect to see you studying at the library so early in the morning.
— , huh?
A．Every dog has its day
B．Many hands make light work
C．The early bird catches the worm
D．Too many cooks spoil the broth
保修期外发生的维修，零配件保修多久？
