“约哈里客”理论
在测量平面直角坐标系中，纵轴为（）。 ["B轴，向东为正","Y轴，向东为正","B轴，向北为正","Y轴，向北为正"]
下列措施中，只能提高安全边际而不能降低保本点的是（） ["提高单价","增加销量","降低单位变动成本","压缩固定成本开支"]
现场应设置专人指挥运输车辆，每次摊铺之前，应由不少于（）部载料车在摊铺机前等候，以保证摊铺机的均匀连续作业，摊铺机部不得中途停顿，不得随意调整摊铺机的行驶速度。 ["3","4","5","6"]
Click the Exhibit button and examine the data from the EMP table. The COMMISSION column shows the monthly commission earned by the employee. Which three tasks would require subqueries or joins in order to be performed in a single step?（） ["deleting the records of employees who do not earn commission","increasing the commission of employee 3 by the average commission earned in department 20","finding the number of employees who do NOT earn commission and are working for department 20","inserting into the table a new employee 10 who works for department 20 and earns a commission that is equal to the commission earned by employee 3","creating a table called COMMISSION that has the same structure and data as the columns EMP_ID and COMMISSION of the EMP table","decreasing the commission by 150 for the employees who are working in department 30 and earning a commission of more than 800"]
原发性妄想多发于（）的精神分裂症，也见于一些器质性精神病。
