什么情况下不会出现“虚液水位”？
参考答案：
1.锅炉负荷的变化幅度和变化速度都很大时；2.燃烧工况急剧变化时；3.炉膛灭火时；4.安全门动作时.
Read and answer. (读一读，答一答)
Hi, I'm Joy. I went to Hainan on my holiday. I swam in the sea. I saw many beautiful fish there.
Bill went to Harbin on his holiday. He went ice-skating and ate good food with his friends. Andy
went to Australia last summer. He rowed a boat with his parents. He took many pictures there.
1. Where did Joy go on his holiday?
____________________________________
2. Did Joy see many beautiful fish there?
3. Who went to Harbin?
4. Where did Andy go on his holiday?
The beauty of the place is more than I can describe. I am sure whoever sees it will _____ its charm.
A．appeal to
B．stick to
C．keep to
D．yield to
