晶体熔化时的温度叫_____，晶体凝固时的温度叫_____，同一种晶体的熔点和凝固点_____。非晶体_____熔点和凝固点。
熔点；凝固点；相同；没有
The players ____ from the whole country are expected to bring us honor in this summergame. [ ]
A. selecting
B. to select
C. selected
D. having selected
简述道路养护的工作原则。
