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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？

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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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仪表阀组可以分为二阀组、三阀组、四阀组和五阀组。

A. 正确
B. 错误