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【单选题】
群落中植物按照高度的垂直配置所形成的层次现象即为（）A.
群落的
B.
群落的成层现象
C.
群落的层片现象
D.
群落的生态位
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反馈参考答案：
举一反三
【单选题】关于归档和压缩命令,下面描述正确的是()
A.
gzip命令和zip命令可以生成扩展名为.zip的压缩文件
B.
unzip命令和gzip命令可以解压缩相同类型的文件
C.
tar归档且压缩的文件可以由gzip命令解压缩
D.
tar命令归档后的文件也是一种压缩文件
【简答题】As we know, Chongqing has changed a lot. Most of the people feel much safer now. More and more trees are being planted in the city. And every day you can see many old people play sports everywhere. Th...
【单选题】More and more trees should be planted in spring to _____ sandstorms happening frequently. [ ]
A.
protect
B.
pr
C.
keep
D.
care
【单选题】在3dmax中，下面哪种曲线是NURBS的曲线类型（）
A.
CV Curve
B.
Bezier Curve
C.
Spline Curve
D.
Mesh Curve
【简答题】As we know, Chongqing has changed a lot in the past few years. More and more trees are being planted in the city. And every day you can see many old people play sports everywhere. The changes make peo...
【单选题】______ more and more trees cut down, many animals and insects are dying out.
A.
Because
B.
With
C.
As
D.
Since
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