“先天下之忧而忧”出自（）散文（）。
参考答案：范仲淹；岳阳楼记
通风与空调工程安全和功能抽查记录有（）
A.通风、空调系统试运行记录
B.风量、温度测试记录
C.制冷机组试运行调试记录
D.洁净室洁净度测试记录
If a needle is thrown ______ on a sheet of paper ruled with lines, how often can it be expected to fall on a line
A．on purpose B．with accuracyC．at random D．according to one’s own will
