资产评估的科学性原则要求（）。 评估程序要结合具体业务的实际情况，尽量降低评估成本，提高评估效率。 评估结果应以充分的事实为依据。 评估标准的选择应以特定评估目的为依据。 评估方法的选择要受到可利用的条件、数据以及被评估资产的理化状态的制约。 以科学的态度制定评估方案。
Review the definition of the phone_list view. CHEATE OR REPLACE ALGORITHM=MERGE DEFINER= 'root'@localhost' SQL SECURITY DEFINER VIEW 'phone_list' AS SELECT e . id as id 'e . first_name AS 'first_name' 'e . last_name AS 'last_name' 'coalesce ( ph1.phone_no, ' – ') AS 'office_no' 'coalesce (ph2 .phone_no, ' – ') AS 'cell_no' FROM employees e LEFT JOIN employee_phone ph1 ON ph1.emp_id = e.id AND ph1.type = 'office' LEFT JOIN employee_phone ph2 ON ph2 .emp_id = e.id AND ph2 .type = 'mobile' The tables employees and employee_phone are InnoDB tables; all columns are used in this view. The contents of the phone_list view are as follows: Mysql> select * from phone_list; 1 row in set (0.00 sec) Which method can you use to change the cell_no value to '555-8888' for John Doe?（） INSERT INTO employee_phone (emp_id, phone_no, type) VALUES (1, '555-8888','mobile')。 UPDATE phone_list SET cell_name '555-8888' WHERE first_name= 'John' and last_name= 'Doe'。 DELETE FROM phone_list WHERE first_name= 'John' and last_name= 'Doe'; INSERT INTO phone_list (first_name, last_name, office_no, cell_no) VALUES ('John' , 'Doe' , 'x1234' , '555-8888)。 UPDATE employee_phone SET phone_no= '555-8888' where emp_id=1。
史称美国内战是美国历史上的第二次资产阶级革命，主要是由于（）。 政府通过了《宅地法》。 维护了国家的统一。 废除了奴隶制。 使”西进运动”得以继续进行。
Which two statements are true about the primary key constraint in a table？ （） It is not possible to disable the primary key constraint.。 It is possible to have more than one primary key constraint in a single table.。 The primary key constraint can be referred by only one foreign key constraint.。 The primary key constraint can be imposed by combining more than one column.。 The non-deferrable primary key constraint creates an unique index on the primary key column if it is not already indexed.。
许某，男性，55岁，脊柱结核手术后卧床2周，出现右小腿疼痛、有紧束感，并逐渐出现水肿。该患者出现的术后并发症是（） 肌肉萎缩。 水电解质紊乱。 关节炎。 切口感染。 下肢深静脉血栓形成。
Examine the following ALTER command:
SQL> ALTER DISKGROUP dgroup1 UNDROP DISKS;
What is the purpose of the command?（）
