题目内容
A．14kB．15kC．16kD．17k
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A．fi（X)=min{fi-1（X),fi-1（X)+pi}B．fi（X)=max{fi-1（X),fi-1（X-Wi)+piC．fi（X)=min{fi-1（X-wi)
A．{A}{A,B,C,D,E}{A,B,C,D,E,P,G,H,I,J,K}B．{F}{G}{H}{I}{J}{K}{B,F,G}{C,H}{D,I,J}{E,K}{A,
一个系统的模块结构图如下所示，用{X,X,X}表示这个系统的测试模块组合。下面的选项中(20)表示自顶向下的测试，(21)表示三明治式测试。
As hard as【60】may be, sit back and chill, experts advise. Though you've got to get them to do it,【61】helping too much, or even examining【62】too carefully, you may keep them【63】doing it by themselves. "I wouldn't advise a parent to check every【64】assignment," says psychologist John Rosemond, author of Ending the Tough Homework. "There's a【65】of appreciation for trial and error. Let your children【66】the grade they deserve. " Many experts believe parents should gently look over the work of younger children and ask them to rethink their【67】. But "you don't want them to feel it has to be【68】," she says.
That's not to say parents should【69】homework first, they should monitor how much homework their kids【70】. Thirty minutes a day in the early elementary years and an hour in【71】four, five, and six is standard, says Rosemond. For junior-high students it should be "【72】more than an hour and a half," and two for high school students. If your child【73】has more homework than this, you may want to check【74】other parents and then talk to the teacher about【75】assignments.
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