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單項(xiàng)選擇題

linux系統(tǒng)中,以下顯示結(jié)果不同的是()。

A、echo The current working path is $PWD.
B、echo 'The current working path is $PWD.'
C、echo "The current working path is $PWD."
D、echo "The current working path is `pwd`."

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