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【简答题】
阅读理解。 Many teenagers feel that the most important people in their lives are their friends. They believe that their family members, and in particular their parents don't know them as well as their friends do. In large families, it is quite often for brothers and sisters to fight with each other and then they only go to their friends for getting ideas. It is very important for teenagers to have a friend or a circle of friends. Even when they are not with their friends, they usually spend a lot of time talking on the phone. These conversations are very important in children's growing up, because they can discuss something difficult to their family members. Parents often try to choose their children's friends for them. Some parents may even stop their children from meeting their good friends. The question of'choice' is an interesting one. Have you ever thought of the following questions? Who choose your friends? Have you got a good friend your parents don't like? Your answers are welcome. 1. Their know them better than their _____ parents for the teenagers. A. classmates B. friends C. brothers and sisters D. cousins 2. When the teenagers stay alone, they _____. A. go to the cinema B. talk with their parents C. watch TV at home D. talk with their friends 3. Parents should try their best to _____ their children better. A. understand B. answer C. refuse D. afford 4. 'Your answers are welcome' means _____. A. you can answer your children's question B. you have got a good idea C. you can tell us your ideas D. you don't trouble anyone 5. Which is the best title for the passage? A. Only parents can choose B. Teenagers need friends C. The trouble of families D. The most difficult questions
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【简答题】处于介绍期产品的特点是( )。
【简答题】介绍期产品的特点是( )
【单选题】设 A、B、C都是n阶方阵,且A可逆,则必成立的是( )
A.
若 AC=BC,则A=B
B.
若 BC=0,则B=0
C.
若 BA=CA,则B=C
D.
若 A -1 B=CA -1 ,则 B=C
【多选题】介绍期产品的特点是
A.
产品销量大
B.
促销费用高,支付费用的目的是要建立完善的销售渠道
C.
销售利润常常很低甚至为负值
D.
制造成本高
E.
企业应把销售力量投向尽可能多的购买者,尽量缩短介绍期的时间
【多选题】若 n 阶方阵 A、B 都可逆,且 AB=BA ,则下列结论正确的是( ).
A.
B.
C.
D.
【判断题】产生温室效应的气体主要是二氧化碳。
A.
正确
B.
错误
【多选题】介绍期产品的特点是 ( )
A.
产品销量大
B.
促销费用高
C.
利润低甚至为负值
D.
制造成本高
E.
仍存在被市场淘汰的风险
【单选题】设A,B都是n阶方阵,下列说法正确的是( )
A.
若A,B 都是对称阵,则AB 也是对称阵
B.
若 ,且 ,则
C.
若AB 是奇异阵,则A,B 都是奇异阵
D.
若AB 是可逆阵,则 A,B 都是可逆阵
【单选题】设 、C都是n阶方阵,且A可逆,则必成立的是( )
A.
若AC=BC,则A=B
B.
若BC=0,则B=0
C.
若BA=CA,则B=C
D.
若A -1 B=CA -1 ,则B=C
【单选题】若A,B都是n阶方阵,且A,B都可逆,则下述错误的是( )
A.
147A
B.
147B
C.
147C
D.
147D
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