单项选择题
A.大于 B.小于 C.大于等于 D.小于等于
A.50 B.100 C.150 D.200
A.24V B.24±1V C.48V D.48±1V
A.1.6.0-2.6Ω；≥吸起电阻的40% B.1.7—2.7Ω；≥吸起电阻的50% C.1.7.0-2.7Ω；≥吸起电阻的60% D.1.6-2.6Ω；≥吸起电阻的70%
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