The flight tested the heat shield. The shield protected the spacecraft from the great heat produced when it returned through the Earth's atmosphere.
VOA: special.2009.06.10
That great deal of specificity implies that heat is also path-dependent and again we have the convention that if heat is added to the system, the quantity is greater than zero.
热也是与路径有关的,根据通常的习惯,如果我们对系统加热,其符号取为正。
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