简答产品差异化决策实现的途径？

SUNNY SCHOOL

We are a bilingual(双语) school for children of 6-15. We want a cook, a library assistant, a sports coach(教练) and a language teacher.

根据招聘启事，选择最佳答案。

小题1:Which of the following can’t go to Sunny School？

A．A four-year-old child

B．A ten-year-old child

C．An eleven-year-old child

D．A fifteen-year-old child小题2:.Who is not wanted by Sunny School?

A．A cook

B．A headmaster

C．A library assistant

D．A sports coach小题3: Which of the following may not be able to(能) speak English?

A．The language teacher

B．The library assistant

C．The cook

D．The sports coach小题4: The coach must major in _________.

A．Chinese

B．English

C．physical education

D．language小题5: Which is right?

A．The teacher can only teach Chinese.

B．A twenty-five-year old cook can’t work in the school.

C．The library assistant must be careful.

D．A teacher must be strong.

读图，结合已掌握的地理知识回答1—2题。

1、图中①②③④四处，在地质构造上属于背斜的是 [ ]

A、①

B、②

C、③

D、④

2、从城市区位的选择来看，图中①②③④四处最不适宜发展为城市的是 [ ]

A、①

B、②

C、③

D、④

下面的短语中不属于文学修辞手法的是______。

A．反复

B．对偶

C．反问

D．双关

设有n元实二次型

f(x₁，x₂，…x_n)=(x₁+a₁x₂)²+(x₂+a₂x₃)²+…+(x_n-1+a_n-1x_n)²+(x_n+a_nx₁)²，其中a_i(i=1，2，…，n)为实数．试问：当a₁，a₂，…a_n满足何种条件时，二次型f(x₁，x₂，…x_n)为正定二次型．

具有两套解编系统的（）应分别按上下行系统确定改编能力，全站的（）按两系统（）之和计算。