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【单选题】
上图所示是用 555 定时器接成的施密特触发器,已知电源电压 V CC =12V ,则电路的 U T- 为多少?
A.
4V
B.
6V
C.
8V
D.
12V
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参考答案:
举一反三
【判断题】标准溶液的配制有直接法和间接法两种。配制标准溶液时,先配制近似浓度的溶液,选用一种基准物质或另一种已知准确浓度的标准溶液来确定该溶液准确浓度的方法是间接法,确定该溶液准确浓度的过程叫标准溶液的标定()
A.
正确
B.
错误
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【单选题】在以下定义中,正确的说明语句为( )。
A.
int a[b];
B.
int if[100];
C.
int a[3*4];
D.
int a(10);
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【单选题】746 用直接法配制标准溶液时,用来准确确定溶液的体积的仪器是( )
A.
烧杯
B.
天平
C.
量杯
D.
容量瓶
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【简答题】At the special ceremony ______ (毕业生接受学位的), my heart began to race and my mind went blank.
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【单选题】Hearing the news about Neil Armstrong's death,____.
A.
my heart missed a beat
B.
my mind went empty
C.
the newspaper shook with my hands
D.
I was greatly shocked
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【单选题】听力原文:My heart went out to him as he stood forlornly in the courtroom. Which of the following best described my feeling then?
A.
My heart ached when I saw him standing in the courtroom.
B.
I felt sad at seeing him standing alone in the courtroom.
C.
I felt sympathy for him when I saw him standing in the courtroom.
D.
I felt depressed at seeing him standing in the courtroom.
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【单选题】用直接法配制标准溶液时,用来准确确定溶液的体积的仪器是( )
A.
烧杯
B.
天平
C.
量杯
D.
容量瓶
查看完整题目与答案
【单选题】在以下定义中,正确的说明语句为( )。
A.
inta[b]
B.
inta[3,4]
C.
inta[][]
D.
int*a[10]
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【单选题】My heart went ___ to him.
A.
out
B.
on
C.
for
D.
in
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【单选题】在以下定义中,正确的说明语句为( )。
A.
int a['a'];
B.
int a[3,4];
C.
int a[ ][ ];
D.
int a[10];
查看完整题目与答案
相关题目:
【判断题】标准溶液的配制有直接法和间接法两种。配制标准溶液时,先配制近似浓度的溶液,选用一种基准物质或另一种已知准确浓度的标准溶液来确定该溶液准确浓度的方法是间接法,确定该溶液准确浓度的过程叫标准溶液的标定()
A.
正确
B.
错误
查看完整题目与答案
【单选题】在以下定义中,正确的说明语句为( )。
A.
int a[b];
B.
int if[100];
C.
int a[3*4];
D.
int a(10);
查看完整题目与答案
【单选题】746 用直接法配制标准溶液时,用来准确确定溶液的体积的仪器是( )
A.
烧杯
B.
天平
C.
量杯
D.
容量瓶
查看完整题目与答案
【简答题】At the special ceremony ______ (毕业生接受学位的), my heart began to race and my mind went blank.
查看完整题目与答案
【单选题】Hearing the news about Neil Armstrong's death,____.
A.
my heart missed a beat
B.
my mind went empty
C.
the newspaper shook with my hands
D.
I was greatly shocked
查看完整题目与答案
【单选题】听力原文:My heart went out to him as he stood forlornly in the courtroom. Which of the following best described my feeling then?
A.
My heart ached when I saw him standing in the courtroom.
B.
I felt sad at seeing him standing alone in the courtroom.
C.
I felt sympathy for him when I saw him standing in the courtroom.
D.
I felt depressed at seeing him standing in the courtroom.
查看完整题目与答案
【单选题】用直接法配制标准溶液时,用来准确确定溶液的体积的仪器是( )
A.
烧杯
B.
天平
C.
量杯
D.
容量瓶
查看完整题目与答案
【单选题】在以下定义中,正确的说明语句为( )。
A.
inta[b]
B.
inta[3,4]
C.
inta[][]
D.
int*a[10]
查看完整题目与答案
【单选题】My heart went ___ to him.
A.
out
B.
on
C.
for
D.
in
查看完整题目与答案
【单选题】在以下定义中,正确的说明语句为( )。
A.
int a['a'];
B.
int a[3,4];
C.
int a[ ][ ];
D.
int a[10];
查看完整题目与答案
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