高速铁路遮板、栏杆等在梁的活动端处均应断开或在（）处设伸缩缝，间隙满足伸缩要求。
参考答案：梁缝
当双速梯上行爬行过长，下行冲过平层，则上行应调节_，下行应调节_。
My mother can play computer games but my father _____ . [ ]
A. isn't
B. doesn't
C. aren't
D. can't
