多选题下列科学家中发现能量转化和守恒定律的是A.焦耳B.法拉第C.亥姆霍兹D.迈尔

多选题 下列科学家中发现能量转化和守恒定律的是A.焦耳B.法拉第C.亥姆霍兹D.迈尔

ACD解析迈尔最早注意热和功能够相互转化的现象，并对能量转化和守恒定律给予系统表述，之后是亥姆霍兹的研究支持并总结这一定律，最后是焦耳的热功当量实验证实了这一定律，ACD对；法拉第研究电磁现象发现电磁感应定律，B错。

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----------1000 words on signature--------<br>---A signature is a student's name written by himself on the check-list.The act of writing it by himself,not by any other students is called a signature himself.<br>---Since you are asked to write 1000 words Eng.compo on 3 ways how to avoid sign in against the name check-list on the faulty column on the division of page;the following are the suggested 3 ways:-<br>----(1)In response to putting your student's signature onto the paper, find your name first.Sign on the left hand side and not on the right hand side.When lunch-time you follow by signing on the left hand side.When finish school you sign in unbroken succession on the left hand side,,expressing consequence of that day.<br>----(2)Some govt.schools use govt signing paper list. If your class have got 35 students, you and your classmate could orderly sign in nos.35--34 consecutively first..The rest of the students can sign in an orderly manner then..<br>----(3)The teacher will appreciate if students ask him where to sign student's name himself.If not, you can also see how other students' name are written by themselves in their act of writing down their signatures.against the name check-list.<br>----Perhaps you can answer to any other 3 reactions,but these are the replying words for me who answers.

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