12号普通单开道岔的尖轨尖端轨距为()。
A.1437mm
B.1445mm
C.1450mm
D.1453mm
参考答案:B
企业文化是一种()价值观。
A.观念形态
B.理论
C.工具
D.管理活动
Students shouldn't be given so difficult a problem _____ they can not work out.[ ]
A. that
B. which
C. while
D. as