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【单选题】
Because of a logical corruption in your production database, you wanted to perform Tablespace Point in Time Recovery (TSPITR). But before you start the recovery, you queried the TS_PITR_OBJECTS_TO_BE_DROPPED view and realized that there are a large number of objects that would be dropped when you start the recovery by using this method. You want to preserve these objects. Which option must you use to perform TSPITR and preserve the object?（）A.
Perform Export before TSPITR and Import after TSPITR
B.
Move objects to another schema that has the same tablespace assigned
C.
Perform Incomplete Recovery before TSPITR with the Log Sequence Number (LSN)
D.
Perform Incomplete Recovery before TSPITR with the System Change Number (SCN)
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【简答题】两种酶竞争一种底物,生化途径分别为:白色底物+酶P=紫色产物; 白色底物+酶R=红色产物。并且,酶 P 对底物的亲和力显著高于酶R。试问:红色(ppRR) × 紫色(PPrr) (1)F1代表型如何? (2)F2代几种表型?比率如何? (3)两对基因之间的互作类型。
【多选题】在次数分配数列中，()。
A.
各组的频数之和等于工。
B.
各组的频率大于。
C.
频数越小，则该组的标志值所起的作用越小
D.
总次数一定，频数和频率成反比
E.
频率表明各组标志值对总休的相对作用程度