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【单选题】
在干旱和半干旱地区，下列措施中，使绿水中生产性绿水比重提高最多的是
A.
水田改旱地
B.
植树造林
C.
覆膜种植农作物
D.
修建梯田
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A.
输出电阻大
B.
输入电阻小
C.
输出电阻小
D.
输入电阻大
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A.
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【单选题】有两个电压放大倍数相同、输入和输出电阻不同的放大电路 A 和 B ,对同一个具有内阻的信号源电压进行放大,在负载开路的条件下测得 A 的输出电压小。这说明 A 的 ( ) 。
A.
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B.
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C.
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【单选题】有两个电压放大倍数相同而输入、输出电阻不同的放大器A和B,对同一个具有内阻的信号源电压进行放大,当负载开路时,测得A的输出电压小。这说明A的( )。
A.
输入电阻大
B.
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C.
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D.
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【单选题】听力原文： Weather scientists call hurricanes by names to make clear which storm they are talking about. An Australian weather scientist began giving women's names to storms before the end of the ninet...
A.
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B.
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【单选题】[3-34]Above-normal tides near the center of hurricane maybe caused by the ___ .
A.
storm surge
B.
torrential rains
C.
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D.
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【单选题】INTERTROPICAL CONVERGENCE ZONE OVER SOUTH PHILIPPINE PASSING OVER MINDANAO NORTHERN SULU AND PALAWAN. This paragraph is likely to be under the heading of .
A.
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B.
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相关题目：
【单选题】A、B两个放大器,电压放大倍数相同,输入电阻和输出电阻不同。它们对同一个具有内阻的信号源电压进行电压放大,在负载开路条件下,测得A的输出电压大,说明A的( )
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【简答题】33 Like many other Gulfport families, the Koshaks quickly began reorganizing their lives, John divided his family in the homes of two friends. The neighbor with her two children went to a refugee cent...
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【简答题】The Red Cross is ______31____ organization which cares for people who are in ____ 32____ of help. A man in a Paris hospital who needs blood, a woman in Mexico who was injured ____ 33____ an earthquake...
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【单选题】有两个电压放大倍数相同、输入和输出电阻不同的放大电路 A 和 B ,对同一个具有内阻的信号源电压进行放大,在负载开路的条件下测得 A 的输出电压小。这说明 A 的 ( ) 。
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【单选题】有两个电压放大倍数相同而输入、输出电阻不同的放大器A和B,对同一个具有内阻的信号源电压进行放大,当负载开路时,测得A的输出电压小。这说明A的( )。
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【单选题】听力原文： Weather scientists call hurricanes by names to make clear which storm they are talking about. An Australian weather scientist began giving women's names to storms before the end of the ninet...
A.
Before 19th century
B.
During World War Two
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In 1978.
D.
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查看完整题目与答案
【简答题】Although anyone can do it, storm chasing is extremely erous. The power of a big storm 31         throw a cow into the air 32         destroy a whole house in seconds. Storm chasers are also often ...
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【单选题】[3-34]Above-normal tides near the center of hurricane maybe caused by the ___ .
A.
storm surge
B.
torrential rains
C.
jet stream
D.
high barometric pressure
查看完整题目与答案
【单选题】INTERTROPICAL CONVERGENCE ZONE OVER SOUTH PHILIPPINE PASSING OVER MINDANAO NORTHERN SULU AND PALAWAN. This paragraph is likely to be under the heading of .
A.
GALE WARNING
B.
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C.
SYNOPSIS
D.
STORM WARNING
查看完整题目与答案