单项选择题
A.≤DC1.5V B.≥DC1.5V C.≤DC2V D.≥DC2V
A.045MPa～0.6MPa B.0.5MPa～0.6MPa C.0.55MPa～0.65MPa D.0.6MPa～0.7MPa
A.自动 B.半自动 C.手动 D.变动
A.80% B.85% C.90% D.95%
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