准高速车辆承载方式与普速车的区别在于:准高速以()承载。
A.心盘,有间隙
B.旁承,无间隙
C.心盘,无间隙
D.旁承,有间隙
参考答案:B
–---Dear me! I’ve been in America for a month.
-----________ you are settled, why don’t you take up some serious study ?
A.If
B.Now that
C.When
D.Even if
集中操纵的道岔(引向安全线、避难线的除外),是否须保持定位?