单项选择题
A.1 B.2 C.3 D.4
A.≤15 B.≤16 C.≤17 D.≤18
A.1.6-2.6Ω；≥吸起电阻的40% B.1.7-2.7Ω；≥吸起电阻的50% C.1.7-2.7Ω；≥吸起电阻的60% D.1.6-2.6Ω；≥吸起电阻的70%
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