单项选择题

辨识句中的一处错误，答案填写Ａ，B，C，D字母。
Soon after Mel has finished his thesis, he will leave for Boston, where he has a
A B C
job waiting on him.
D

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单项选择题

设A,B为n阶方阵，则以下一定正确的是（）.
A.

B.

C.

D.

循环流化床锅炉冷渣器的作用是降低排渣温度、回收排渣物理显热。( )
正确
错误

答案：正确