如图,一束光穿过凸透镜射向焦点F,请画出它的入射光线;图是闭合开关S后小磁针静止

题型:应用设计题

问题:

如图,一束光穿过凸透镜射向焦点F,请画出它的入射光线;图是闭合开关S后小磁针静止在螺线管旁的情况,请标出小磁针的N极。

考点:光的折射现象
题型:应用设计题

下列哪一项是诊断食管癌的最主要依据()

A.进行性吞咽困难病史

B.食管脱落细胞检查

C.食管吞钡X线摄片

D.胸部X线摄片

E.CT检查

题型:应用设计题

I am a psychologist. I first met Timothy, a quiet, overweight eleven­year­old boy, when his mother brought him to me to discuss his declining grades. A few minutes with Timothy were enough to confirm that his self-esteem (自尊) and general happiness were falling right along with them.

I asked about Timothy’s typical day. He awoke every morning at six thirty so he could reach his school by eight and arrived home around four thirty each afternoon. He then had a quick snack, followed by either a piano lesson or a lesson with his math tutor. He finished dinner at 7 pm, and then he sat down to do homework for two to three hours. Quickly doing the math in my head, I found that Timothy spent an average of thirteen hours a day at a writing desk.

What if Timothy spent thirteen hours a day at a sewing machine instead of a desk? We would immediately be shocked, because that would be called children being horribly mistreated. Timothy was far from being mistreated, but the mountain of homework he faced daily resulted in a similar consequence — he was being robbed of his childhood. In fact, Timothy had no time to do anything he truly enjoyed, such as playing video games, watching movies, or playing board games with his friends.

Play, however, is a crucial part of healthy child development. It affects children’s creativity, their social skills, and even their brain development. The absence of play, physical exercise, and free­from social interaction takes a serious toll on many children. It can also cause significant health problems like childhood obesity, sleep problems and depression.

Experts in the field recommend the minutes children spend on their homework should be no more than ten times the number of their grade level. As a fifth­grader, Timothy should have no more than fifty minutes a day of homework (instead of three times that amount). Having an extra two hours an evening to play, relax, or see a friend would soundly benefit any child’s life quality.

小题1:What did the writer think of Timothy after learning about his typical day__________?

A.Timothy was very hard­working.

B.Timothy was being mistreated.

C.Timothy had a heavy burden.

D.Timothy was enjoying his childhood.小题2:Which of the following statements best describes the writer’s opinion________?

A.Children should be allowed enough time to play.

B.Playing board games works better than playing video games.

C.The more they play, the more creative children will become.

D.The depression caused by homework makes children unwilling to play.小题3:According to the passage, how long should a third­grader spend a day doing homework________?

A.About ten minutes.

B.No more than twenty minutes.

C.No more than thirty minutes.

D.About fifty minutes.

题型:应用设计题

连接流量计外接电源时,是否可以由井口工操作完成?

题型:应用设计题

下列措施费中,属于文明施工费的是()

A.现场施工机械设备降低噪声、防扰民措施费用

B.施工现场操作场地的硬化费用

C.施工现场采用彩色、定型钢板,砖、混凝土砌块等围挡的安砌、维修、拆除费用

D.现场污染源的控制、生活垃圾清理外运、场地排水排污措施费用

题型:应用设计题

预制楼板存放数量每堆不超过()件。

A.5

B.10

C.15

D.20

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