正确答案: B

物体从单一热源吸收的热量可全部用于做功

题目：关于热力学定律，下列说法正确的是

解析：B

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学习资料的答案和解析：

[单选题]AChristopher Thomas, 27, was a writer by night and a teacher by day when he noticed he was always tired and was losing weight fast. Diagnosed with diabetes(糖尿病), Thomas would need to inject himself with insulin(胰岛素) three times a day for the rest of his life or risk nerve damage, blindness, and even death. And if that weren't bad enough, he had no health insurance.

He has a positive attitude to this disease.

解析：

细节理解题。通读全文可知，Christopher Thomas对于自己的疾病采取了积极的态度，所以C项正确。A项与Thomas would need to inject himself with insulin(胰岛素) three times a day for the rest of his life不符；B项与文中的Thomas开办网站，与病人及其家属分享有关的信息和资源不符；D项提到的写作是Thomas的专职工作，而他的志愿工作才是运作Fight It 这个慈善机构。

[单选题]下列各句中，没有语病的一句是

随着“天河一号”的问世，我国成为继美国后第二个能够研制运算速度为每秒千万亿次的超级计算机的国家，在这一重要科学领域中跻身前列。

[单选题]的共同特征是：(1)木本；(2)花单性，单被或无花被；(3)雄花排成柔荑花序；(4)子房下位；(5)坚果。①昆栏树科②金缕梅科③榆科④桑科⑤大麻科⑥胡桃科⑦壳斗科⑧桦木科

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