A.1 B.2 C.3 D.4
A.≤15 B.≤16 C.≤17 D.≤18
A.1.6-2.6Ω;≥吸起電阻的40% B.1.7-2.7Ω;≥吸起電阻的50% C.1.7-2.7Ω;≥吸起電阻的60% D.1.6-2.6Ω;≥吸起電阻的70%