单项选择题
A.De+30mm B.De+40mm C.De+20mm D.De+60mm
A.De+20---30mm B.De+30---40mm C.De+25---40mm D.De+40---60mm
A.De+20mm B.De+30mm C.De+25mm D.De+40mm
A.20—25mm B.20—30mm C.30—40mm D.35—40mm
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