同向曲线两超高顺坡终点间直线长度，困难情况下不应短于()。
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直线型尖轨，尖轨长度为6250mm以下，尖轨尖端的轨距为()。
Any open flame can’t exist in this business building
A. Yes. We’ve removed all the flammable gas.
B. Yes. We’ve searched everywhere for flammable liquid
C. Yes. All the flammable liquid and gas have been removed already.
D. Yes. We’ve removed all the liquid, gas and wood which can be burned
Have you trained your employees in terms of the common knowledge of fire prevention？
A. Yes. We have a routine training every month.
B. Yes. We organized a fire drill every year
C. Not yet. But we will make it up soon
D. No. We are expected to fulfill this plan to train employees in fire prevention
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