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问题
填空题
锅炉的化学清洗工作,包括()和()两项任务。
答案
参考答案:新锅炉投入运行前的煮炉;已运行锅炉的化学除垢
选择题
He's one of the students who ______ a winner of scholarship for three years.
A. is
B. are
C. has been
D. have been
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单项选择题
中国第一座皇帝陵是()
A.黄帝陵
B.秦始皇陵
C.邯郸赵王陵
D.燕下都王陵
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