涎腺恶性肿瘤中最常见的是______________________。
参考答案:粘液表皮样癌
Beijing: The United States and North Korea had their first ______ in four months here this afternoon as part of the ______ negotiations on how to end North Korea’s nuclear program, but diplomats played down prospects for______. James A. Kelly, assistant ______, and Kim Yong Ⅱ, North Korea’s deputy foreign minister, met ______ of formal discussions, ______ on direct dialogue that began after a stormy meeting ______ in which North Korea warned that it was moving quickly to ______ nuclear arms. The Bush administration had insisted ______ that it would only hold talks with North Korea ______ because, it argued, only ______ pressure would persuade North Korea to______. It got its way when North Korea dropped its insistence on ______ and agreed, after extensive efforts by China, to hold unusual simultaneous negotiations with ______,______,______ and ______ as well as the United States. Though Bush administration officials had not ______ talking privately with the North Koreans during______, the fact that Mr. Kelly and Mr. Kim met on the first day was seen as a sign of ______ by the American side.
下列关于热化学反应的描述中正确的是
A.HCl和NaOH反应的中加热△H ="-57.3" kJ/mol,则H2SO4和Ca(OH) 2反应的
中和热△H =2×(-57.3)kJ/mol
B.CO(g)的燃烧热是283.0 kJ/mol,则2CO2(g)2CO(g)+O2(g)反应
的△H =" +2×283.0" kJ/mol
C.需要加热才能发生的反应一定是吸热反应
D.1 mol甲烷燃烧生成气态水和二氧化碳所放出的热量是甲烷的燃烧热