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【单选题】
Paragraph 5 One problem with negative consequences is that parents can lose sight of when to stop giving them. If one consequence doesn’t work, parents often try another that is harsher. They begin piling negative consequences on top of negative consequences. This can lead to an upward spiral where the parent ends up grounding the child for the next five years, or something outlandish like that. This often happens when parents are frustrated and upset. Children know which “buttons” to push, and parents can quickly lose their patience. That’s when “the snowball effect” usually takes place. For example, Amy’s dad asked her to clean her room. She didn’t do the chore so her dad took away her telephone privileges for the weekend. Her room was messy the next day. For this, she lost a week of TV privileges. The room didn’t get any cleaner and her father got madder and more frustrated. Which of the following statements best expresses the main idea of the paragraph?
A.
 Positive reinforcement is the best method of parenting.
B.
 Kids should not be told to clean their rooms.
C.
 The “snowball effect” of negative consequences is not an effective method of discipline
D.
 Children know how to frustrate their parents.
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举一反三
【简答题】若在正交函数 之外,不存在函数 , 满足等式 : 则此函数集称为 。
【简答题】中规模时序电路分析设计 74LS192是十进制计数器,计数的编码采用8421码,计数循环是0000~1001,74LS192是采用双时钟方式的可逆计数器。 是进位输出,加法计数进入状态1001后产生一个周期宽度的负脉冲输出。借位输出是 ,减法计数进入状态0000后产生一个周期宽度的负脉冲输出。如图为74LS192构成的计数器,74LS1l92功能表如表所示。解答如下问题: 74LS192的逻辑功能...
【单选题】时序逻辑电路如图所示,原状态为 Q 1 Q 2 =00 ,当送入两个 CP 脉冲后的新状态为( )。
A.
00
B.
11
C.
10
D.
01
【单选题】时序逻辑电路如图所示,原状态为 Q 1 Q 2 =00 ,当送入一个 CP 脉冲后的新状态为( )。
A.
00
B.
11
C.
01
D.
10
【单选题】在立式铣床上用立铣刀铣垂直面时,适用于基准面宽而长,加工面( )的工件
A.
B.
C.
较大
D.
较小
【单选题】在立式铣床上用立铣刀铣垂直面时,适用于基准面宽而长,加工面( )的工件
A.
B.
C.
D.
【单选题】③时序逻辑电路如图10.31所示,Q 1 Q 0 原状态为10,当送入一个CP脉冲后的新状态为(    )。
A.
10    
B.
01    
C.
11
【单选题】下面哪一项不属于均匀层中的大气?()
A.
水汽
B.
干洁大气
C.
气溶胶质粒子
D.
臭氧
【判断题】遗传控制分类,实验动物可分成近交系、突变系、杂交一代动物和封闭群动物四大类动物。
A.
正确
B.
错误
【单选题】Only by practicing a few hours everyday be able to master the language.
A.
you can
B.
can you
C.
you will
D.
will you
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