在最高层和最低层平层位置时，轿箱和对重撞板跟缓冲器顶面距离符合油压缓冲器（）。
参考答案：250-400MM
任何企业以及企业内部培训需求分析的主体都是一样的。( )
Great changes have taken place in that school. It is no longer ______ it was 20 years ago, ____it was poorly equipped.
A．what; when
B．that; which
C．what; which
D．which; that
