有人说：布尔什维主义和布尔什维克党的产生，标志着与西欧社会民主党根本不同的新型的马克思主义政党的出现。这种“新型”是指（）。 以实现无产阶级专政为目标。 以暴力革命为斗争手段。 以马克思主义理论为指导。 有列宁为首的坚强领导。
滚动轴承代号中，自右至左第一、二位数字是表示轴承的（），其计算方法是该数（）。
You are maintaining the SALES database of a company. You have never backed up the USERS tablespace that is currently offline. On Sunday， you issued the following commands： CONFIGURE DEFAULT DEVICE TYPE TO sbt； CONFIGURE BACKUP OPTIMIZATION ON； CONFIGURE RETENTION POLICY TO REDUNDANCY 3； From Monday to Saturday， you performed the following actions： Day Action Monday BACKUP DATABASE Tuesday BACKUP DATABASE Wednesday BACKUP DATABASE Thursday BACKUP DATABASE Friday BACKUP DATABASE Saturday BACKUP DATABASE How many times will the backup of the USERS tablespace be performed？（） The backup will not be performed at all.。 three times。 four times。 six time。
pKa值是指（）。 药物90％解离时的pH值。 药物99%解离时的pH值。 药物50％解离时的pH值。 药物不解离时的pH值。 药物全部解离时的pH值。
You plan to move data from a flat file to a table in your database. You decide to use SQL*Loader directpath load method to perform this task. The table in which you plan to load data is an important tablehaving various integrity constraints defined on it. Which constraints will remain enabled by default during this operation（） CHECK。 UNIQUE。 NOT NULL。 PRIMARY KEY。 FOREIGN KEY。
You want to perform a backup of your database to tape. Which backup format can you use？（）
