带式输送机巷道中行人跨越带式输送机处应设()
参考答案:过桥
―Do you prefer spring ________ summer?
―________, because it’s warm and flowers start to come out.
A.to, Yes
B.or, Yes
C.to, Either
D.or, Neither
集合竞价是交易所电脑主机对开盘前的全部委托申报进行集中撮合处理的过程()