问题
选择题
下列变化中,物体内能未增加的是: [ ]
A.水结成冰
B.干冰升华
C.水沸腾汽化
D.锯条锯木头,锯条发烫
答案
答案:A
下列变化中,物体内能未增加的是: [ ]
A.水结成冰
B.干冰升华
C.水沸腾汽化
D.锯条锯木头,锯条发烫
答案:A
根据短文内容,用方框中所给词语的适当形式填空。
的) animal on land (陆地上). I __4__eating __5__. I'm __6__ and intelligent. I can help people __7__ many things. I'm your __8__. Many people are __9__ to us. __10__ I'm sad that some people kill (杀 死) many of us for our teeth (牙齿). |