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【判断题】
经过珊瑚礁盘时，宜从其下风方向通过。
A.
正确
B.
错误
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【单选题】Water— the Issue of This Century The world is running short of fresh water．Populations are growing bigger and thirstier(渴的), with the result that fresh water is becoming increasingly scarce(缺乏)．Half t...
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】Text 2 We recently sailed with our research ship through the Red Sea to the Indian Ocean where we did research work for about a year. Our main objectives (目标) were the little-known Maldi...
A.
the coral reef exists in regions with warm climate
B.
the coral reef provides favorable living conditions for them
C.
the creatures are away from the er of being eaten by sharks
D.
most sea creatures feed on the colourful coral
【单选题】当北印度洋海区洋流呈逆时针方向流动时
A.
开普敦温和多雨
B.
无论南北半球海洋表面的等温线都向南凸出
C.
北京、广州两地相同物体的日影等长
D.
亚平宁半岛受西风带控制
【单选题】两列沿相反方向传播的相干波,其表达式为y1=Acos2π(νt-x/λ)和y2=Acos2π(νt+x/λ)。叠加后形成驻波,其波腹位置的坐标为
A.
x=±kλ
B.
x=±(2k+1)λ/2
C.
x=±kλ/2
D.
x=±(2k+1)λ/4
相关题目：
【单选题】Water— the Issue of This Century The world is running short of fresh water．Populations are growing bigger and thirstier(渴的), with the result that fresh water is becoming increasingly scarce(缺乏)．Half t...
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】Text 2 We recently sailed with our research ship through the Red Sea to the Indian Ocean where we did research work for about a year. Our main objectives (目标) were the little-known Maldi...
A.
the coral reef exists in regions with warm climate
B.
the coral reef provides favorable living conditions for them
C.
the creatures are away from the er of being eaten by sharks
D.
most sea creatures feed on the colourful coral
【单选题】当北印度洋海区洋流呈逆时针方向流动时
A.
开普敦温和多雨
B.
无论南北半球海洋表面的等温线都向南凸出
C.
北京、广州两地相同物体的日影等长
D.
亚平宁半岛受西风带控制
【单选题】两列沿相反方向传播的相干波,其表达式为y1=Acos2π(νt-x/λ)和y2=Acos2π(νt+x/λ)。叠加后形成驻波,其波腹位置的坐标为
A.
x=±kλ
B.
x=±(2k+1)λ/2
C.
x=±kλ/2
D.
x=±(2k+1)λ/4
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