You have a read-only tablespace on read-only media. You want to perform a media recovery on the existing data files， but using a backup control file. The backup control file indicates that the status of the read-only tablespace was read/write when the control file was backed up. What should you consider？（）
A. take data files from the read-only tablespace offline before performing a recovery
B. recovery using backup control file is not possible， so restore all the files from the last full database backup， and then open the database
C. drop the read-only tablespace and re-create the tablespace after recovery
D. perform a recovery； status of the tablespace in control file will be changed automatically
铁路运输企业应当对承运的货物、包裹、行李自接受承运时起到交付时止发生灭失、短少、变质、污染或者损害，承担赔偿责任，下列说法正确的是（）。
A. 托运人或者旅客根据自愿申请办理报价运输的，按照实际损失赔偿，但最高不超过保价额
B. 未按保价运输承运的，按照实际损失赔偿，但最高不超过国务院铁路主管部门规定赔偿限额，但是铁路运输企业的故意或者重大过失造成损失的除外
C. 托运人或者旅客根据自愿可以向保险公司办理货物运输保险，保险公司按照保险合同的约定承担赔偿责任
D. 不得以任何方式强迫办理保价运输或者货物运输保险
E. 不可抗力造成的损失
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