[单选题]Essentially constant conditions are known to exist in both the horizontal and vertical directions in both short and long beds.本句采用( )语态。
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2023-10-01 08:00:41
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[单选题]Essentially constant conditions are known to exist in both the horizontal and vertical directions in both short and long beds.本句采用( )语态。

A.被动
B.主动
C.过去
D.现在
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