在地面CTCS-2级和CTCS-1/0级区段边界增设特殊用途的CTCS级间切换应答器，其设置的基本要求是：线路允许速度大于160km/h
参考答案：错
(2014·枣庄模拟)—He should have been warned of the danger.
—________，but he wouldn’t listen to me.
A．So he had
B．So had he
C．So was he
D．So he was
把3，-5，7，-13四个数利用“24点”游戏规则，可写成算式______使其结果等于24．
