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【多选题】
下列关于RS-232与RS-485的区别描述正确的是?
A.
RS-232采用通讯,RS-485采用平衡传输
B.
RS-232的传输距离不超过20米,RS-485的传输距离可达几十米到上千米
C.
RS-232在PC机是COM1,RS-485在PC机是COM2
D.
RS-232一对一通信,RS-485一对多通信
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【单选题】三峡水库控制长江上游流域面积大约100万平方公里,三峡水库的校核洪水位为180.4m,设计洪水位为175.0m,汛期防洪限制水位为145.0m,防洪库容可达( )亿立方米。
A.
150.0
B.
221.5
C.
300.0
D.
234.0
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【单选题】Young people's social environment has a ____ effect on their academic progress.
A.
gross
B.
solid
C.
complete
D.
profound
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【单选题】What progress has been made in their negotiations?
A.
Israeli troops can stay on in the West Bank.
B.
Israel has released thousands of prisoners.
C.
PLO and lsrael have reached a final agreement.
D.
the future of Hebron, the only town in the West Bank where there is a community of Jewish settlers.
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【单选题】All the slaves wanted freedom _____ they had fought for hundreds of years. [ ]
A.
which
B.
what
C.
that
D.
for which
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【单选题】Young people's social environment has a ______ effect on their academic progress.
A.
gross
B.
solid
C.
profound
D.
complete
查看完整题目与答案
【单选题】在建的三峡水库控制长江上游流域面积大约100万平方公里,三峡水库的校核洪水位为180.4m,设计洪水位为175.0m,汛期防洪限制水位为145.0m,防洪库容可达()亿立方米。但是,今年三峡工程防洪水位只有156米,仅能使荆江河段防洪标准由不足10年一遇提高到20年一遇。
A.
150.0
B.
221.5
C.
300.0
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【单选题】三峡水库控制长江上游流域面积大约100万平方公里,三峡水库的校核洪水位为180.4m,设计洪水位为175.0m,汛期防洪限制水位为145.0m,防洪库容可达( )亿立方米。
A.
150
B.
221.5
C.
300
D.
234
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【单选题】She really wanted to know what was his job . Correction(改错):________________________________.
A.
She really wanted to know what’s his job
B.
She really wanted to know his job
C.
She really wanted to know what his job was
D.
She really wanted to know was his job
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【单选题】( 6 )设 x 、 y均为float型变量,则以下赋值语句不合法的是( )。
A.
++x;
B.
y=(x%2)/10;
C.
x*=y+8;
D.
x=y=0;
查看完整题目与答案
【简答题】Young people’s social environment has a ________ effect on their academic progress. A) gross B) solid C) complete D) profound
查看完整题目与答案
相关题目:
【单选题】三峡水库控制长江上游流域面积大约100万平方公里,三峡水库的校核洪水位为180.4m,设计洪水位为175.0m,汛期防洪限制水位为145.0m,防洪库容可达( )亿立方米。
A.
150.0
B.
221.5
C.
300.0
D.
234.0
查看完整题目与答案
【单选题】Young people's social environment has a ____ effect on their academic progress.
A.
gross
B.
solid
C.
complete
D.
profound
查看完整题目与答案
【单选题】What progress has been made in their negotiations?
A.
Israeli troops can stay on in the West Bank.
B.
Israel has released thousands of prisoners.
C.
PLO and lsrael have reached a final agreement.
D.
the future of Hebron, the only town in the West Bank where there is a community of Jewish settlers.
查看完整题目与答案
【单选题】All the slaves wanted freedom _____ they had fought for hundreds of years. [ ]
A.
which
B.
what
C.
that
D.
for which
查看完整题目与答案
【单选题】Young people's social environment has a ______ effect on their academic progress.
A.
gross
B.
solid
C.
profound
D.
complete
查看完整题目与答案
【单选题】在建的三峡水库控制长江上游流域面积大约100万平方公里,三峡水库的校核洪水位为180.4m,设计洪水位为175.0m,汛期防洪限制水位为145.0m,防洪库容可达()亿立方米。但是,今年三峡工程防洪水位只有156米,仅能使荆江河段防洪标准由不足10年一遇提高到20年一遇。
A.
150.0
B.
221.5
C.
300.0
查看完整题目与答案
【单选题】三峡水库控制长江上游流域面积大约100万平方公里,三峡水库的校核洪水位为180.4m,设计洪水位为175.0m,汛期防洪限制水位为145.0m,防洪库容可达( )亿立方米。
A.
150
B.
221.5
C.
300
D.
234
查看完整题目与答案
【单选题】She really wanted to know what was his job . Correction(改错):________________________________.
A.
She really wanted to know what’s his job
B.
She really wanted to know his job
C.
She really wanted to know what his job was
D.
She really wanted to know was his job
查看完整题目与答案
【单选题】( 6 )设 x 、 y均为float型变量,则以下赋值语句不合法的是( )。
A.
++x;
B.
y=(x%2)/10;
C.
x*=y+8;
D.
x=y=0;
查看完整题目与答案
【简答题】Young people’s social environment has a ________ effect on their academic progress. A) gross B) solid C) complete D) profound
查看完整题目与答案
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