下列知识结构中有错误的是（ ）
A．改变内能的方法
|
答案：C
A、改变物体内能有两种方式：一是做功，二是热传递，故A正确，但不符合题意；
B、扩散是指不同物质的分析彼此进入对方的现象，可以发生在固体之间、液体之间、气体之间，故B正确，但不符合题意；
C、内燃机最常用的是汽油机和柴油机，故C错，符合题意；
（4）由吸热公式Q吸=cm△t可知物体升温吸收的热量与物体的质量、比热容、温度的升高值有关，故D正确，但不符合题意；
故选C．
| Do you have problem in your life and not know how to be happy? If 1 , you will find Being Happy Teenager written by the Australian writer Andrew Matthews 2 . In his book, Matthews 3 us how to live a happy life and answer the questions from teenagers. There are 4 subjects such as parents and friends,and the book says we should stop 5 and forgi e宽恕). The 6 tells as useful skills such as how to put what you have learned into pictures of your mi do 7 your memory better. Many teenagers think 8 happi ess comes from a good exam result 9 praise (赞扬) from other people. But you can 10 be happy when there are no such good things. Success comes from a good att~tude~f you 11 problems,you will achieve success in the future. Some school students have 12 such as being too tall or too short. But Matthews tells us that happiness comes from tH k~g about things 13 a positive way.lf you are 14 , people notice you and you can get a better view at the movie;if you are short,your clothesand shoes take less 15 in your bedroom! This is Matthews' most important lesson:youchoose to be happy! | ||||
|