单选题
发布日期:2020-04-10
Are there at least ten RS-232 ports available on the HMC?
Are there at least ten RS-422 ports available on the HMC?
Are there at least ten RS-232 and two RS-422 ports available on the HMC?
Are there at least two RS-232 and ten RS-422 ports available on the HMC?
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