A.1 B.2 C.3 D.4
A.流體被加熱時(shí)取0.3,被冷卻時(shí)取0.4 B.流體被加熱時(shí)取0.4,被冷卻時(shí)取0.3 C.液體被加熱時(shí)取0.4,氣體被加熱時(shí)取0.3 D.液體加熱時(shí)取0.3,氣體被加熱時(shí)取0.4