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【单选题】
设有一物体,占有空间闭区域 ,在点 处的密度为 ,该物体的质量 ( ).A.
0.25
B.
0.5
C.
1
D.
1.5
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A.
There are
B.
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C.
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D.
There were
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A.
there are
B.
are there
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are they
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B.
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A.
Is; Yes, there are
B.
Are; Yes, there are
C.
Is; No, there isn’t
D.
Are; No, there isn’t
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A.
Are; there are
B.
Is; it is
C.
Are; they are
D.
Is; there is
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