单项选择题
A.2000mm;1200mmB.1000mm;2000mmC.1800mm;1200mmD.1800mm;1300mm
A.300mm;100mmB.200mm;100mmC.300mm;200mmD.300mm;300mm
A.20mm;20mmB.10mm;20mmC.20mm;10mmD.15mm;15mm