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【简答题】
观察下列各式： 1×3=3=2 2 ﹣1， 2×4=8=3 2 ﹣1， 3×5=15= _____ ﹣1， 4×6=24= _____ ﹣1， … 12×14=168= _____ ﹣1． （1）请根据题意填空． （2）你能用只含有一个字母的等式表示它的规律吗？请试一试．
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举一反三
【单选题】哪一种模式与市场沟通最顺畅
A.
区域型
B.
产品型
C.
大客户
D.
顾客型
查看完整题目与答案
【单选题】鸽子每次啄绿色键就能得到食物,这属于行为训练中的( )。
A.
负强化
B.
正强化
C.
消退
D.
惩罚
查看完整题目与答案
【单选题】膜表面的流速增大,则____。
A.
浓度极化减弱，截留率增加
B.
浓度极化减弱，截留率减小
C.
浓度极化增强，截留率增加
D.
浓度极化增强，截留率减小
查看完整题目与答案
【判断题】引发“五四”爱国运动的直接导火索是巴黎和会上中国的外交失败。
A.
正确
B.
错误
查看完整题目与答案
【单选题】What is one advantage of solar drip irrigation systems mentioned in the passage?
A.
They are more reliable.
B.
They have initial advantage.
C.
They don't break down from time to time.
D.
They are more economical over time.
查看完整题目与答案
【判断题】五四运动的直接导火索，是巴黎和会上中国外交的失败。
A.
正确
B.
错误
查看完整题目与答案
【单选题】膜表面的流速增大,则(
A.
浓差极化减弱，截留率增加
B.
浓差极化减弱，截留率减小
C.
浓差极化增强，截留率增加
D.
浓差极化增强，截留率减小
查看完整题目与答案
【单选题】According to the last paragraph, what can be concluded?
A.
Solar and wind energy systems cost a lot for producing electricity.
B.
People had better pay for the utility instead of producing electricity.
C.
Solar and wind energy can provide cheap and continuous electricity.
D.
Solar and wind energy is reasonable and cheap for remote villagers.
查看完整题目与答案
【单选题】Choose the word or phrase that is closest in meaning to the underlined part. NASA worked in the 1970s and early 1980s to research the possibilities of using Solar Power Satellite (SPS) systems with la...
A.
shed solar energy to the Earth’s surface from the satellite
B.
set the satellite down to the Earth’s surface with power
C.
shut down the power on the Earth’s surface from the satellite
D.
switch off power to the Earth’s surface from the satellite
查看完整题目与答案
【单选题】膜表面的流速增大,则浓度极化( ),截留率( )。
A.
减弱，增加
B.
减弱，减小
C.
增强，增加
D.
增强，减小
查看完整题目与答案
相关题目：
【单选题】哪一种模式与市场沟通最顺畅
A.
区域型
B.
产品型
C.
大客户
D.
顾客型
查看完整题目与答案
【单选题】鸽子每次啄绿色键就能得到食物,这属于行为训练中的( )。
A.
负强化
B.
正强化
C.
消退
D.
惩罚
查看完整题目与答案
【单选题】膜表面的流速增大,则____。
A.
浓度极化减弱，截留率增加
B.
浓度极化减弱，截留率减小
C.
浓度极化增强，截留率增加
D.
浓度极化增强，截留率减小
查看完整题目与答案
【判断题】引发“五四”爱国运动的直接导火索是巴黎和会上中国的外交失败。
A.
正确
B.
错误
查看完整题目与答案
【单选题】What is one advantage of solar drip irrigation systems mentioned in the passage?
A.
They are more reliable.
B.
They have initial advantage.
C.
They don't break down from time to time.
D.
They are more economical over time.
查看完整题目与答案
【判断题】五四运动的直接导火索，是巴黎和会上中国外交的失败。
A.
正确
B.
错误
查看完整题目与答案
【单选题】膜表面的流速增大,则(
A.
浓差极化减弱，截留率增加
B.
浓差极化减弱，截留率减小
C.
浓差极化增强，截留率增加
D.
浓差极化增强，截留率减小
查看完整题目与答案
【单选题】According to the last paragraph, what can be concluded?
A.
Solar and wind energy systems cost a lot for producing electricity.
B.
People had better pay for the utility instead of producing electricity.
C.
Solar and wind energy can provide cheap and continuous electricity.
D.
Solar and wind energy is reasonable and cheap for remote villagers.
查看完整题目与答案
【单选题】Choose the word or phrase that is closest in meaning to the underlined part. NASA worked in the 1970s and early 1980s to research the possibilities of using Solar Power Satellite (SPS) systems with la...
A.
shed solar energy to the Earth’s surface from the satellite
B.
set the satellite down to the Earth’s surface with power
C.
shut down the power on the Earth’s surface from the satellite
D.
switch off power to the Earth’s surface from the satellite
查看完整题目与答案
【单选题】膜表面的流速增大,则浓度极化( ),截留率( )。
A.
减弱，增加
B.
减弱，减小
C.
增强，增加
D.
增强，减小
查看完整题目与答案