A．15% B．20% C．25% D．30%
A．5mm B．10mm C．15mm D．20mm
A．40mm B．60mm C．80mm D．100mm
A．20m B．40m C．60m D．80m
A．1000mm B．1100mm C．1200mm D．1500mm
A．2 B．3 C．4 D．5
A．2．5m B．3m C．3．5m D．4m
A．1．80m B．2．00m C．2．20m D．2．50m
A．150mm B．120mm C．100mm D．80mm
A．3m B．4m C．5m D．6m
