将标准状况下的a升氨气溶于1000克水中，得到的氨水的密度为b克/毫升，则该氨水

家鸡羽毛芦花(B)对非芦花(b)为显性，且基因位于Z染色体上，请你设计一个方案，单就羽毛特征就可以把早期雏鸡的雌性和雄性区分开来：[     ]

A．芦花雌鸡(Z^BW)×非芦花雄鸡(Z^bZ^b)

B．芦花雌鸡(Z^BZ^B)×非芦花雄鸡(Z^bW)

C．非芦花雌鸡(Z^bW)×芦花雄鸡(Z^BZ^b)

D．非芦花雌鸡(Z^bZ^b)×芦花雄鸡(Z^BW)

早晨，当3面对太阳，3的左面是______，3的右面是______．

大陆上那些相对较高的地区，是沉积区的物质供给区，称为（）或物源区。

A、成岩区

B、岩石区

C、沉积区

D、侵蚀区

下列事件过程的功能是：建立一个名为Datal的随机文件，存放角度值及这些角度的正弦函数值和余弦函数值，角度为1，2，3，…，90。请选择正确的程序段是( )，将程序补充完整。
Private Type Ang
K As Integer
Sinx As Single
Cosx As Single
End Type
Dim Ksc As Ang
Private Sub Form_Click()
Dim Y As Single
Dim i As Integer
Dim Ksc As Ang
Open ______
Y=3.14159/180
For i=1 To 90
Ksc.K=i
Ksc.Sinx=Sin(i*Y)
Ksc.Cosx=Cos(i*Y)
Next i
Close #2
End Sub

A．"..\Datal.txt"For Random As #1 Len=10 Put #1，i，Ksc

B．"..\Datal.txt"For Random As #1 Len=10 Put #1，Y，Ksc

C．"..\Datal.txt"For Random As #1 Put #1，i，Ksc

D．"..\Datal.txt"For Random As #1 Put #1，Y，Ksc

Astute service providers realize that the continued support of legacy X.25 and asynchronous network element using separate operations network is cost(16).For example,the maintenance of multiple networks can require additional staff. Often, this staff must be trained on multiple vendor technologies, sometimes requiring parallel groups specializing in each (17) .Hence, additional maintenance procedures must be maintained and administrative records are (18) .The duplication of transport facilities to carry (19)network traffic is an inefficient use of resources. And not surprisingly, more technologies installed in a central office means the necessity for more physical space, and an increase in power connections and power consumption migration of these (20) network elements to IP-based DCns is alogical strategy.

空白处（19）应选择（）

A.overlook

B.overlie

C.overlay

D.overleap