[多选题]有下列情形之一的，为险性事件?
A.载客列车挤岔。
B.非载客列车脱轨、冲突、分离。
C.列车溜逸，或者机车车辆溜走并进入正线。
D.载客列车脱轨、冲突、分离。

Keeping Cut Flowers
1 While everybody enjoys fresh cut flowers around their house, few people know how to keep them for as long as possible. This may be done by keeping in mind a few simple facts.
2 An important thing to remember about cut flowers is that they are sensitive to temperature. For example, studies have shown that cut carnations (康乃馨) retain their freshness eight times longer when kept at 12’(2 than when kept at 26’(3. Keeping freshly. harvested flowers at the right temperatures is probably the most important aspect of flower care.
3 Flowers are not intended by nature to live very long. Their biological purpose is simply to attract birds or insects, such as bees, for pollination (授粉). After that, they quickly dry up and die. The process by which flowers consume oxygen and produce carbon dioxide (二氧化碳), called respiration (呼