听力原文:W: Did you say sorry to your teacher, Mike? M: Why must I? W: You were late this morning. M: But I wasn't. When I got to school, I was just on time for class. What is Mike?
A.
A teacher.
B.
A student.
C.
A writer.
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【单选题】Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the_______.