F频点组网时,一般不会受到下面()系统的杂散干扰。 A.WLAN B.CDMA800

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问题:

F频点组网时,一般不会受到下面()系统的杂散干扰。

A.WLAN

B.CDMA800/CDMA2000

C.GSM900/DCS1800

D.PHS

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设集合A={x|x2+3x-4=0},B={x|ax+2=0,x∈R},若A∩B=B,求实数a的取值范围.

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James McDonald and Veasna Lu were discussing different ways of valuing a Treasury security. During their discussion Lu made the following statements: Statement 1: It is inappropriate to discount the cash flows of a Treasury security by a single discount rate because that is implicitly assuming that the yield curve is flat. Therefore, each individual cash flow should be discounted by its corresponding spot rate. Statement 2: The spot rates used for different time periods that produce a value equal to the market price of a Treasury bond are called forward rates or future expected spot rates. Are the statements made by Lu regarding bond spot rates correct Statement 1 Statement 2 ()①A. Correct Correct②B. Incorrect Incorrect③C. Correct Incorrect

A. ①

B. ②

C. ③

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一个圆柱的底面半径是2分米,高5分米,它的侧面积是______平方分米,表面积是______平方分米,体积是______立方分米.

题型:单项选择题

一个正常基因B,在下列何种情况下可能会变成它的等位基因b()

A.基因的自由组合

B.基因突变

C.染色体结构的变异

D.基因的分离

题型:单项选择题

下列关于水平度盘和垂直度盘说法正确的有()

A.水平度盘都是顺时针注记

B.水平度盘随照准部转动

C.垂直度盘都是顺时针注记

D.垂直度盘随望远镜转动

E.视线水平时,竖直度盘读数为90°

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