装设空气预热器的燃油锅炉,尾部应装设可靠的()及()装置。
参考答案:吹灰、灭火
阅读理解。
1. The picture is about ______.
A. fitness clubs
B. language clubs
C. dance clubs
2. What is the percentage (百分比) of students in the clubs?
A. 2.6%
B. 13.6%
C. 16.9%
儿童最常见的发展障碍是()。
A.孤独症
B.精神发育迟滞
C.抽动秽语综合症
D.注意缺陷多动障碍