PDSCH接受哪些传输信道的映射() ["BCH","PCH","DL-SCH","MCH"]
DVD读取光盘信息时,采用()光束工作。 ["三","双","单","四"]
依法取得中华人民共和国国籍的民用航空器,应当标明规定的国籍标志和:() ["公司标志","登记标志","机型标志"]
目前MeSH表提供的限定词的数量为()。 ["A、80个","B、81个","C、82个","D、83个"]
12inLD关盘机(CAV)电动机转速应为()r/min。 ["1000","1500","1800","2000"]
简述分析作案人的人身特点。