简述链条炉分层燃烧特点。
参考答案：
减少锅炉漏煤量、煤层厚度平整均匀、提高燃烧效率
After getting lost in a storm, a member of the navy team ________ four days later.[ ]
A. rescued
B. was rescued
C. has rescued
D. had been rescued
国务院关于完善退耕还林政策有哪些配套措施？
