造成（）的直接经济损失列为重大事故。 1亿元以上。 5000万以上1亿元以下。 1000万元以上5000万以下。 500万元以上1000万以下。
相电压是（）V 380V。 220V。
Examine the description of the EMPLOYEES table: EMP_ID NUMBER(4) NOT NULL LAST_NAME VARCHAR2(30) NOT NULL FIRST_NAME VARCHAR2(30) DEPT_ID NUMBER(2) Which statement produces the number of different departments that have employees with last name Smith?（） SELECT COUNT(*) FROM employees WHERE last_name='Smith';。 SELECT COUNT(dept_id) FROM employees WHERE last_name='Smith';。 SELECT DISTINCT(COUNT(dept_id)) FROM employees WHERE last_name='Smith';。 SELECT COUNT(DISTINCT dept_id) FROM employees WHERE last_name='Smith';。 SELECT UNIQUE(dept_id) FROM employees WHERE last_name='Smith'。
"三个和尚没水喝"反映的群体心理现象是（） 社会助长。 社会惰化。 群体模仿。 从众。
Your company includes mobile computer users who frequently work offline. You are planning to deploy Windows 7 by using an image. You have the following requirements： Provide access to all applications when mobile computer users first start their computers. Minimize network and local storage requirements. Provide language-pack support based on the geographic location of the user. You need to ensure that your image-creation strategy meets the requirements. What should you do？（） Create a single thin image for all computers.。 Create a single hybrid image for all computers.。 Create one thin image for the mobile computers. Create one thick image for all other computers.。 Create one thick image for the mobile computers. Create one thin image for all other computers.。
下列气体中不易发生爆炸而引起火灾的是（）
