终毒物常是母体化合物，也可能是母体化合物的代谢产物或者是在毒物生物转化期间产生的活性氧。
What command would you use to ensure that backup records in the control file are pointing to actual physical files on the backup media？（） [" crosscheck"," list backup"," confirm"," resync"," backup validate"]
常用的一种光谱抗生素是（） ["青霉素","链霉素","庆大霉素","金霉素"]
两台变比相同的电流互感器，当一次线圈串联，二次线圈也串联使用时，则总的变比（）。 ["增加一倍","减小一倍","不变"]
You have backed up your database twice without connecting to the recovery catalog. What command do you issue to transfer the control-file metadata to the recovery catalog？（） [" synch catalog"," resync catalog"," replicate catalog"," update catalog"," restore catalog"]
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