让世人瞩目的我国首条磁悬浮列车线路在上海建成,科学家们利用磁悬浮使得列车与导轨脱离接触,目的是为了 ,从而提高车速。
减小摩擦
— What kind of movies do you like?
— I like the movies ________are about Chinese history.
A.who
B.whom
C.whose
D.that
当市话电缆不可避免与1kV~10kV电力线路合杆时,二者间净距不应小于( );与1kV电力线路合杆时,净距不应小于( )。
A.3.0~3.5m;2~2.5m
B.3.5m;2.5m
C.2.5~3.0m;1.5~2.0m
D.2.5m;1.5m