單項選擇題
A.20cmB.25cmC.30cmD.35cm
A.500mB.550mC.600mD.550~600m
A.400mB.450mC.500mD.450?500m
A.10mB.20mC.30mD.40m
A.400mB.450mC.500mD.550m
A.400mB.600mC.800mD.1000m
A.0.65?0.9mB.0.75?1.0mC.0.85?1.1mD.0.95?1.2m
A.35mmB.36mmC.50mmD.55mm
A.整體性B.穩(wěn)定性C.可靠性D.耐久性
A.2mB.3mC.4mD.5m