《桃花扇》中的阮大铖在现实中曾创作出《燕子笺》等佳作。
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企事业单位改进工作设计、优化劳动环境的必要条件是（）
A. 岗位分析
B. 岗位调查
C. 岗位分类
D. 岗位评价
湘西土家族农历正月第一个马日所举行的盛大传统节日活动叫什么？
Exchange of answer-backs acts a confirmation that the messages（）at the destination.
A. have received
B. have been received
C. are received
D. are being received
入炉铁矿含铁总量，应按各种铁矿耗用量乘该矿含铁量加权平均求得。
A. 正确
B. 错误
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