单项选择题

Throughout the course, much use is made of temperature differences, but no use is made of temperature sums. ______

A．通过整个过程，温差得到了使用，但没有用温度总和。
B．在整个路径中，温度的利用是不同的，但总的温度没利用。
C．在整个过程中，充分利用了温差，但却没有利用温度的总和。
D．在整个过程中多次利用了不同温度，但没有利用温度的总和。
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