填料压盖与轴套外径间隙为（）。
A.0.75～1.0mm
B.0.8～1.2mm
C.1.0～1.5mm
D.1.6～1.8mm
参考答案：A
Water is very important _____ all living things. We must _____ every drop of water.[ ]
A. for; leave
B. for; keep
C. to; save
D. to; show
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