边坡养护与维修的要求是坡面保持()、坚实无(),其坡度符合设计规定。
参考答案:平顺;冲沟
—Is there __________ in today’s newspaper?
—Yes, the top news is about H7N9.
A.something new
B.anything important
C.everything interesting
D.nothing serious
配料室测料时应卡断()个事故开关。
A.1
B.2
C.全部