可动心辙叉道岔的改道作业,用调整不同号码轨距挡块调整还不足时可加垫片调整,但厚度不得超过()。
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Can journalists take photos at the press conference to be held before the performance？
A. Yes, they can. But they’ve got to take photos in a certain place
B. Yes, they can. But they’ve got to take photos in designated places.
C. Yes, they can. But they have to find a suitable place
D. Yes, they can. But they’ve got to take photos at lower places.
Are you responsible for the maintenance of surveillance cameras within one year？
A. Yes. Our company promises to provide free service
B. Yes. Our company promises to provide post-sale services.
C. Yes. Our company promises to provide good post-sale services.
D. No. Our company doesn’t promise to provide post-sale services.
采用抛物线形竖曲线时,凡相邻坡段的坡度代数差大于()时须设计竖曲线。
速度为100km/h以下正线道岔轨道静态经常保养水平容许偏差管理值为()。
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