单项选择题
A.60B.70C.80D.100
A.外压B.内压C.外压、内压
A.0.6~0.9B.0.2~0.7C.0.2~0.6D.0.2~0.5
A.0.3~0.5B.0.2~0.7C.0.2~0.6D.0.2~0.5
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