The net present value formula for one period is A: NPV = C0 + [C1/(1 + r)]. B: NPV = PV required investment. C: NPV = C0/C1. D: NPV = C1/C0.

设c1. c2均是char类型变量，则以下不正确的函数调用为______

通常把地层压力当量密度在（）之间的地层压力称为正常压力地层。 A: A10.5～15.5kPa/m B: B1.0～2.5kPa/m C: C1.～1.07g/cm³ D: D1.～1.07kPa/m

批判性思维量表[br][/br]C1.我敢于在权威面前发表自己的不同观点( ) A: 非常不符合 B: 不符合 C: 有点不符合 D: 有点符合 E: 符合 F: 非常符合

中国大学MOOC: IIdentify the topics from A, B, and C1. A growing number of people feel that animals should not be exploited by people and that they should have the same rights as humans, while others argue that humans must employ animals to satisfy their various needs, including uses for food and research.

C组C1.要建一个容积为[img=19x17]17e0aa9b017e08d.png[/img],侧面为圆柱面,顶部接着一个半球形的仓库(不含底部)。已知顶部单位面积的造价是其侧面圆柱面部分造价的[img=12x19]17e0a6e3b6180a5.png[/img]倍,试求该仓库的底圆半径,使得仓库造价最省.

设.向量可表示为的线性组合:,则() A: a=-1,b=-1,c=-1 B: a=1,b=-1,c=-1 C: a=-1,b=1,c=-1 D: a=-1,b=-1,c=1

共有4个站进行码分多址通信。4个站的码片序列为：a：（-1 -1 -1 +1 +1 -1 +1 +1） b：（-1 -1 +1 -1 +1 +1 +1 -1）c：（-1 +1 -1 +1 +1 +1 -1 -1） d：（-1 +1 -1 -1 -1 -1 +1 -1）现收到这样的码片序列：（+1 +1 -1 +3 +1 +1 -3 +1），则（ ）发送1。 A: a和d B: a C: b和c D: c

A、B、C三个站点采用CDMA技术进行通信，A、B要向C发送数据，设A的码片序列为+1，-1，-1，+1，+1，+1，+1，-1。则B可以选用的码片序列为: -1，+1，-1，+1，-1，+1，+1，+1|-1，+1，-1，+1，-1，+1，-1，+1|-1，+1，-1，-1，-1，+1，+1，+1|-1，-1，-1，+1，-1，+1，+1，+1

下列哪个码片序列不能用于CDMA通信 A: ( -1 -1 -1 +1 +1 -1 +1 +1 ) B: ( -1 -1 +1 -1 +1 +1 +1 -1 ) C: ( -1 +1 -1 +1 +1 -1 -1 -1 ) D: ( -1 +1 -1 -1 -1 -1 +1 -1 )