【单选题】乔布斯曾经说过,当产品人不再是推动公司前进的人,而是由营销人推动公司前进,这种情况是最危险的。很多公司有非常杰出的工程师和聪明的员工,但是从根本上而言,这些公司更需要将所有一切集合在一起的“地心引力”,即产品。这体现了苹果公司()的经营理念。
【单选题】设A={a,b,c,d},A上的关系R={(a,b),(a,c),(c,a),(d,c),(d,d)},则R的逆关系为
A.
{(d,d),(d,c),(c,a),(a,c),(a,b)}
B.
{(b,a),(a,c),(c,a),(c,d),(d,d)}
C.
{(a,a),(b,b),(c,c),(a,d),(b,c),(b,d)}
D.
{(a,a),(b,b),(c,c),(b,a),(d,a),(c,b),(a,d),(b,c),(d,b),(b,d),(c,d)}
【单选题】设A={a,b,c,d},A上的关系R={(a,b),(a,c),(c,a),(d,c),(d,d)},则R的补关系为
A.
{(d,d),(d,c),(c,a),(a,c),(a,b)}
B.
{(b,a),(a,c),(c,a),(c,d),(d,d)}
C.
{(a,a),(b,b),(c,c),(a,d),(b,c),(b,d)}
D.
{(a,a),(b,b),(c,c),(b,a),(d,a),(c,b),(a,d),(b,c),(d,b),(b,d),(c,d)}
【单选题】差动变压器测量电路的非零点输出的原因是( )。
【判断题】人类经历了原始文明、农业文明、工业文明,生态文明是工业文明发展到一定阶段的产物。()
【简答题】Read this extrac from an article called Famous Mums and Dads and complete the gaps with the best form of the verb in brackets. 'It (1) was my birthday yesterday: I'm 14 years old. Some people say I'm ...
【简答题】5具有放大环节的串联型稳压电路在正常工作时,调整管处于____工作状态。
【简答题】We are a small business and we are just starting, so we don't buy all our office equipment. We ______ things like photocopiers, printers, and the machines in our cafeteria. We are lucky because there...
【简答题】阅读下面对话,并根据对话内容完成表格. Dr David Weeks has spent years studying these so-called 'Superyoung' people. Now the reporter(R) is interviewing Dr Weeks(DW). R: Dr Weeks, could you start by telling us exactly wh...
【单选题】Finding a Job At sixteen Ron Mackie might have stayed at school, but the future called to him excitedly. 'Get out of the classroom into a job, ' it said, and Ron obeyeD.His father, supporting the deci...
A.
His father made him leave
B.
He had reached the age when he had to leave.
C.
He left because he was worried about the future.
D.
He left because he wanted to start work.