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【简答题】
Music can be a great power (力量) to change people’s lives. Regina del Carmen Sanchez, 14, always believes this. The girl from Kansas City, US, leads a hard life. She lives in a small house with her mom and grandparents. Her mom gets a very low pay. But it doesn’t stop Sanchez’s love of music. She wrote her first song Keep Your Head Up when she was 12. It described the bad situation(情况) at her home, but it also sent the message of hope: “My house is old and poor, but it beats (胜过) being homeless… Love yourself and never give up. You’ll see a better life if you keep your head up…” It took Sanchez several months to finish the song. Sometimes during a break in class, when lyrics (歌词) came into her head, “I would have to write them down right then,” she told the local newspaper The Kansas City Star. Jeremy Lillig was a spokesman for Bright Futures, a charity fund. When he saw the video of the song, he was moved. He shared it through social media (社交媒体). The fund has provided money for poor students in Kansas City. Now Sanchez often plays the song in public. “I want to help people understand what is happening in the world in an easy way,” she said. 小题1:There are ____ people in Sanchez’s family. A.three B.four C.five D.six 小题2: What’s true about Keep Your Head Up?  ______________________ A.It was written two years ago. B.It showed a feeling of hopeless. C.It described the good situation of a house. D.It took Sanchez several weeks to write the song. 小题3: The word “moved” can be replaced (代替) by ____. A.surprised B.interested C.touched D.excited 小题4: The best title of the passage can be . A.A girl and her song B.Poor home is better than being homeless C.Charity changes the girl’s life D.Let’s support poor students.
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【单选题】Mathematica软件中,计算 ,其中L是抛物线 上从点(-1,1)到点(1,1)的一段弧的命令为( )。
A.
Clear["`*"]; Integrate[x^2-2x*y[x]+(y[x]^2-2x*y[x])*dy[x],{x,-1,1}]
B.
y[x_]:=x^2; dy[x_]:=D[y[x],x]; Integrate[x^2-2x*y[x]+(y[x]^2-2x*y[x])*dy[x],x,-1,1]
C.
y[x_] =x^2; dy[x_] =D[y[x],x]; Integrate[x^2-2x*y[x]+(y[x]^2-2x*y[x])*dy[x],{x,-1,1}]
D.
y[x_]:=x^2; dy[x_]:=D[y[x],x]; Integrate[x^2-2x*y[x]+(y[x]^2-2x*y[x])*dy[x],{x,-1,1}]
【多选题】关于微观组织,以下说法正确的是
A.
微观组织也可用肉眼观察获得;
B.
微观组织必须用金相显微镜或电子显微镜观察获得;
C.
观察试样必须经过磨光和抛光;
D.
观察试样还需要进行化学浸蚀。
【单选题】已知字母A的ASCII码为十进制的65,执行下列语句 char ch1,ch2;ch1='A'+'5'-'3';ch2='A'+'6'-'3';printf("%d,%c\n",ch1,ch2);后的输出是()
A.
67,D
B.
B,C
C.
C,D
D.
不确定的值
【单选题】氢弹之父、物理学家爱德华.特勒曾设想:向空中抛洒铝和硫的粉末,给地球降温。特勒提出的办法是要模仿大规模的火山爆发。1991年,波及范围达数百万千米的皮纳图博火山灰使地球气温下降了0.41℃,而且持续时间达好几个星期。但生物化学家们却给这种主张泼冷水,他们认为,散布于空中的这些硫和铝的微粒,很可能会严重干扰同温层。特勒还与人合作过其他使地球降温的方法:在轨道上放置5万面反射镜;发射一颗巨大的卫星,悬...
A.
向空中抛洒铝和硫的粉末,可以给地球降温
B.
火山灰的主要成分是硫和铝
C.
特勒曾与人合作试验过在轨道上放置反光镜给地球降温的方法
D.
爱德华.特勒为了研究给地球降温进行过仔细的研究
【简答题】已知字母 a 的 ASCII 码为十进制数 97 ,且设 ch 为字符型变量,则表达式“ ch='a'+'8'-'3' ”的值为 ____________
【简答题】计算下列对坐标的曲线积分:(1)∫L(x^2-y^2)dx ,其中L是抛物线y=x^2上从点(0,0)到点(2,4)的一段弧高等数学复旦大学出版第三版下册课后习题答案习题十一 计算下列对坐标的曲线积分: (1)∫L(x^2-y^2)dx ,其中L是抛物线y=x^2上从点(0,0)到点(2,4)的一段弧;
【单选题】氢弹之父、物理学家爱德华?特勒曾设想:向空中抛洒铝和硫的粉末,给地球降温。特勒提出的办法是要模仿大规模的火山爆发。1991年,波及范围达数百万千米的皮纳图博火 山灰使地球气温下降了0.41°C,而且持续时间达好几个星期。但生物化学家们却给这种 主张泼冷水,他们认为,散布于空中的这些硫和铝的微粒,很可能会严重干扰同温层。特勒还与人合作过其他使地球降温的方法:在轨道上放置5万面反射镜;发射一颗巨大的卫...
A.
向空中抛洒铝和硫的粉末,可以给地球降温
B.
火山灰的主要成分是硫和铝
C.
特勒曾与人合作试验过在轨道上放置反光镜给地球降温的方法
D.
爱德华?特勒为了研究给地球降温进行过仔细的研究
【简答题】计算∫L(x+y)dx+(y-x)dy ,其中L是(1)抛物线y^2=x上从点(1,1)到点(4,2)的一段弧高等数学复旦大学出版第三版下册课后习题答案习题十一 计算∫L(x+y)dx+(y-x)dy ,其中L是 (1)抛物线y^2=x上从点(1,1)到点(4,2)的一段弧; (2)从点(1,1)到点(4,2)的直线段; (3)先沿直线从(1,1)到点(1,2),然后再沿直线到点(4,2)的折线;...
【多选题】内锥的车削的方法有哪些?
A.
转动小滑板法
B.
偏移尾座法
C.
宽刃刀法
D.
绞内锥法
【简答题】已知字母A的ASCII码为十进制的65,下面程序的输出是___A___。main(){char ch1,ch2;ch1='A'+'5'-'3';ch2='A'+'6'-'3';printf(“%d,%c\n”,ch1,ch2);}A.67,D B.B,C C.C,D D.不确定的值
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