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如图4-9所示，在光滑水平地面上，一质量为M的物体以v0的速度做匀速直线运动．把另一质量为m的物体轻放在M上，由于m与M间的摩擦作用，经时间t后两者以共同速度运动．求： （1）两物体共同运动速度的大小v； （2）在时间t内，m所受摩擦力的大小．
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【单选题】以下程序的功能是：按顺序读入10名学生4门课程的成绩，计算出每位学生的平均分并输出，程序执行后的运行结果不正确，调试中发现有一条语句在程序中的位置不正确，这条语句是哪一条？（ ）#includeintmain(){intn,k;floatscore,sum,ave;sum=0.0;for(n=1;n<=10;n++){for(k=1;k<=4;k++){scanf("%f",&score);sum...
A.
第6行，sum=0.0;
B.
第12行，sum+=score;
C.
第14行，ave=sum/4.0;
D.
第15行，printf(“第%d位学生的平均分是%f\n”, n,ave);
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【单选题】Directions: There are two passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should de...
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【单选题】Directions: There are two passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should de...
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【单选题】以下程序的功能是：按顺序读入10名学生4门课程的成绩，计算出每位学生的平均分并输出，程序执行后的运行结果不正确，调试中发现有一条语句在程序中的位置不正确，这条语句是哪一条？（ ）#includeintmain(){intn,k;floatscore,sum,ave;sum=0.0;for(n=1;n<=10;n++){for(k=1;k<=4;k++){scanf("%f",&score);sum...
A.
第6行，sum=0.0;
B.
第12行，sum+=score;
C.
第14行，ave=sum/4.0;
D.
第15行，printf(“第%d位学生的平均分是%f\n”, n,ave);
查看完整题目与答案
【单选题】Section C Directions: There are two passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You...
A.
They are like his family members who also died during the war.
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A.
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B.
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D.
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【判断题】接触器主要用于控制电动机,能频繁的接通或者断开交直流主回路,实现远距离自动控制。( )
A.
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B.
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【简答题】接触器主要用于自动控制( )
查看完整题目与答案
【简答题】接触器主要用于自动控制( )( )和( )。
查看完整题目与答案
【单选题】This girl really knew how to underline-not only the juicy parts,( )the beautiful passages about love.
A.
and
B.
or
C.
but also
D.
nor
查看完整题目与答案
【单选题】Directions: There are two passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should de...
A.
It focuses on the horrible things a girl saw during World War II.
B.
It was written by a little girl hiding away during the Nazi occupation.
C.
It tells stories about the sufferings of people in a Nazi concentration camp.
D.
It is difficult to understand and relate to if the reader doesn't know history.
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