按开启方式不同，窗可以分为（）等几种
A、平开窗
B、悬窗
C、推拉窗
D、单层窗
E、双层窗
参考答案：A, B, C
Fifty applicants for a job were given scores from 1 to 5 on their interview performance. Their scores are shown in the table above. What was the average score for the group ？（）
A. 2.79
B. 2.86
C. 2.91
D. 2.99
E. 3.03
气体冷凝器管束与壳体联接形式采取（）
A.顶部焊接
B.底部焊接
C.上下部均采取焊接方式
D.法兰连接
