对该井修井前历次井下事故情况有无了解均不耽误施工。
参考答案:错
Mary is ___ honest girl and will go to ___ college after she finishes middle school.
A.a, a
B.an, the
C.a, the
D.an, /
为了防止钢轨爬行,在所有区段都要求扣件阻力必须大于道床纵向阻力。