单选题Which of the following is true of the heating system of the Johnstown campus?AThe heat is supplied by human bodies only.BThe heat is supplied by both human bodies and other heat-emitting objects.CThe heat is supplied by both human bodies and conventional fuel.DThe heat is supplied by human bodies, other heat-emitting objects, and conventional fuel.
单选题
Which of the following is true of the heating system of the Johnstown campus?
A
The heat is supplied by human bodies only.
B
The heat is supplied by both human bodies and other heat-emitting objects.
C
The heat is supplied by both human bodies and conventional fuel.
D
The heat is supplied by human bodies, other heat-emitting objects, and conventional fuel.
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解析：
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