系统工程三维结构由（）构成。

A、准则维

B、方案维

C、知识维

D、时间维

E、逻辑维

通常需要对项目管理信息系统故障和存在的缺陷、错误进行（）

802.11协议簇定义了多种WLAN接入标准，目前采用最为广泛的标准是什么？

The ORDERS table has these columns: The ORDERS table tracks the Order number, the order total, and the customer to whom the Order belongs. Which two statements retrieve orders with an inclusive total that ranges between 100.00 and 2000.00 dollars?（）

SELECT customer_id, order_id, order_total FROM orders RANGE ON order_total (100 AND 2000) INCLUSIVE;

SELECT customer_id, order_id, order_total FROM orders HAVING order_total BETWEEN 100 and 2000;

SELECT customer_id, order_id, order_total FROM orders WHERE order_total BETWEEN 100 and 2000;

SELECT customer_id, order_id, order_total FROM orders WHERE order_total >= 100 and <= 2000;

SELECT customer_id, order_id, order_total FROM orders WHERE order_total >= 100 and order_total <= 2000;

试说明引起进程创建的主要事件.

The EMP table has these columns: ENAME VARCHAR2(35) SALARY NUMBER(8,2) HIRE_DATE DATE Management wants a list of names of employees who have been with the company for more than five years. Which SQL statement displays the required results?（）

A、SELECT ENAME FROM EMP WHERE SYSDATE-HIRE_DATE >5;

B、SELECT ENAME FROM EMP WHERE HIRE_DATE-SYSDATE >5;

C、SELECT ENAME FROM EMP WHERE (SYSDATE_HIRE_DATE)/365 >5;

D、SELECT ENAME FROM EMP WHERE (SYSDATE_HIRE_DATE)*/365 >5;