投资项目前期项目建议书阶段对投资估算误差的精度要求是( )。A.±10% B.±1

题型:单项选择题

问题:

投资项目前期项目建议书阶段对投资估算误差的精度要求是( )。

A.±10%

B.±15%

C.±20%

D.±30%

考点:注册咨询工程师项目决策分析与评价项目决策分析与评价
题型:单项选择题

化简:

(1)(5a2+2a)-4(2+2a2);

(2)5x2(x+1)(x-1);

(3)(x+3y)2-(2x+y)(x-y);

(4)4(m+1)2-(2n+5)(2m-5).

题型:单项选择题

设有两个关系R和S,且R和S有相同的属性,R与S的自然连接是由投影、选择和笛卡尔积三个运算组成的。关于三个运算的次序的描述中,正确的是( )。

A.先投影,再选择,最后笛卡尔积

B.先笛卡尔积,再投影,最后选择

C.先笛卡尔积,再选择,最后投影

D.三个运算的次序无关紧要

题型:单项选择题

SOX is an alternative syntax for (71) . It is useful for reading and creating XML content in a text editor. It is then easily transformed into proper XML. SOX was created because developers can spend a great deal of time with raw XML. For many of us, the popular XML (72) have not reached a point where their tree views, tables and forms can completely substitute for the underlying. (73) language. This is not surprising when one considers that developers still use a (74) view, albeit enhanced, for editing other languages such as Java. SOX uses (75) to represent the structure of an XML document, which eliminates the need for closing tags and a number of quoting devices. The result is surprisingly clear.

A.SOA

B.UDDI

C.XML

D.Web Service

题型:单项选择题

同步端口以()Mb/s数字电路接入承租方的通信网。

题型:单项选择题

美国海军太平洋舰队现拥有三大编号作战舰队,其中不包括下列的()。

A、第3舰队

B、第4舰队

C、第5舰队

D、第7舰队

更多题库