用反证法证明命题“三角形的内角至多有一个钝角”时,假设的内容应为( )
A:假设至少有一个钝角
B:假设至少有两个钝角
C:假设没有一个钝角
D:假设没有一个钝角或至少有两个钝角
某单位在公开招聘新员工时,为一领导子女“量身定做”了招聘条件。事件曝光后受到广大市民的谴责。市民谴责的直接原因是 ( )
①体现了***始终坚持群众观点,践行以人为本、执政为民的执政理念
②反映了***具有与时俱进的执政能力,适应时代需要,不断深化认识
③体现了***不断转变工作中心,解决主要矛盾,推动人与社会全面发展
④表明了***遵循社会发展规律,认识到初级阶段的基本国情已经发生变化
关于家庭电路和安全用电,下列说法正确的是( )
____
Many students in China are learning English. Some of these students are small children Others are teenagers(青少年). Many are adults(成年人). Some learn at school, others study by themselves. A few learn English language over the radio, on television or in films. One must work hard to learn another language.Why do all these people want to learn English? It is difficult to answer that question. Many boys and girls learn English at school because it is one of their subjects. They study their own(自己的) language, Maths and English. Some people learn English because it is useful(有用的) for their work. Many people often learn English for their further studies, because at college or university(大学) some of their books are in English. Other people learn English because they want to read newspapers and magazines in English.