【单选题】高效液相色谱法不属于系统适用性试验的项目有( )
【多选题】高效液相色谱法系统适用性试验的项目有()
【判断题】在Oracle所有版本在安装的时候都没有提示修改SYS的默认密码。()
【单选题】It is essential that he ________ all the facts first. (2014)
【简答题】Disneylandis a happy place for both kids and s. The first one was built in LosAngeles and opened on July 17, 1955. Walter E. Disney designed the park andhoped that it would be a source of joy to ...
【简答题】已知l⊥α,m β,则下面四个命题: ①α∥β则l⊥m ②α⊥β则l∥m ③l∥m则α⊥β ④l⊥m则α∥β 其中正确的是___ _____
【单选题】已知类关联如下 : class Employee{ } class Manager extends Employee{ } class Director extends Employee{ } 则下列关于创建对象的语句正确的是 ( )。
A.
Employee e = new Manager();
B.
Director d = new Manager();
C.
Director d = new Employee();
D.
Manager m = new Director();
【判断题】交联度越低树脂越易膨胀,其内部孔隙率越高,离子在树脂内部扩散就较容易。
【单选题】已知类的继承关系如下: class Employee; class Manager extends Employee; class Director extends Employee; 则以下语句能通过编译的语句是( )。
A.
Employee e=new Manager();
B.
Director d=new Manager();
C.
Director d=new Employee();
D.
Manager m=new Director();
【判断题】Oracle默认配置下,每个账户有12次的失败登录,此账户将会被锁定。()