A.電阻式熱流計(jì)B.輻射式熱流計(jì)C.蒸汽熱流計(jì)D.熱水熱流計(jì)
A.有界性B.雙峰性C.對(duì)稱(chēng)性D.抵償性
A.45°B.90°C.120°D.180°