Which userid and password combination is used to access the IBM System Storage DS8000Storage Manager Console as an administrator for the first time?（）A、Admin/adminB、Admin/passwordC、Administator/st0rage (with a zero (0) for the letter "o")D、Admin/passw0rd (with a zero (0) for the letter "o")
Which userid and password combination is used to access the IBM System Storage DS8000Storage Manager Console as an administrator for the first time?（）
- A、Admin/admin
- B、Admin/password
- C、Administator/st0rage (with a zero (0) for the letter "o")
- D、Admin/passw0rd (with a zero (0) for the letter "o")
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单选题以下可用于获取session对象的属性userid的值是（）A session. getAttribute（“userid”）；B session. setAttribute（“userid”）；C request. getParameter（userid）；D session. getAttribute（userid）；
在数据库中，假设有一个用户表，表中含有字段:userid(int).username(varchar).password(varchar)等，该表需要设置主键，以下说法正确的是（） (1.0分) [多选] A. 如果不能有同时重复的username和password，那么username和password可以组合在一起作为主键 B. 此表设计主键时，根据选择主键的最小性原则，最好采用userid作为主键 C. 此表设计主键时，根据选择主键的最小性原则，最好采用username和password作为主键 D. 如果采用userid作为主键，那么在userid列输入的数值，允许为空 E. 如果采用userid作为主键，可以在username列设置not null使得字段非空。