We consider dogs ( ). A、useful the animalsB、useful animalC、the useful animalD、a useful animal
We consider dogs ( ).
A、useful the animals
B、useful animal
C、the useful animal
D、a useful animal
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工作空间 可以用ls()来列出工作空间中的所有变量,用rm()来删除工作空间中的所有变量。 (1)创建变量horses,令其等于5 (2)创建变量dogs,令其等于9 (3)创建变量animals,令其等于horses和dogs之和 (4)查看当前空间有哪些变量 (5)将dogs从当前空间中删除 (6)查看当前空间仍有哪些变量