题目内容
（请给出正确答案）
A.vt． 观察, 观测, 遵守, 评述, 说
B.n． 保留, 预定, 预约
C.vt． 保护, 保持, 保存, 保藏 vi． 做蜜饯, 禁猎 n． 蜜饯, 果酱, 禁猎地, 禁区, 防护物
D.n． 水库, 蓄水池
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更多“preserve [pri5zE:v] （）”相关的问题
B．n． 保留, 预定, 预约
C．vt． 保护, 保持, 保存, 保藏 vi． 做蜜饯, 禁猎 n． 蜜饯, 果酱, 禁猎地, 禁区, 防护物
D．n． 水库, 蓄水池
Privfite Sub Command1_Click()
n=5
f=1
s=0
For i=1 To n
f=f 【 】
s=s+f
Next
Ptint S
End Sub
该事件过程的功能是计算s=1+2!+1/3!+...+1/n!的值。请填空。
April 5-30
Spellman Convention Center
Olympia City, Washington
More than 200 domestic and imported car manufacturers will display their 2007 product lines.
For exhibitor & sponsor information: http//www.spellrnanmtshow.com
How many days will this show last？
A．5 days.
B．30 days.
C．26 days.
D．10 days.
A、you
B、them
C、that
D、it
We have(4)your letter of 23rd April and take(5)in making you the following offer subject to your reply reaching us by the end of this month．
| 完形填空。 | ||||
| At the beginning of this century, medical scientists made an interesting discovery: we are built not just of flesh (肌肉) and blood but also of time. They were1to show that we all have a 'body clock'2us, which controls the3and fall of our body energies,4us different from one day to the next. The5of a 'body clock' should not be too6since the lives of most living things are controlled7the 24-hour night-and-day cycle (循环). We fell8and fall asleep at night and become9and energetic during the day. If the 24-hour cycle is10most people experience unpleasant11, For example, people who are not 12to working at night can find that13of sleep causes them to14badly at work. 15the daily cycle of sleeping and16, we also have other cycle which17longer than one day. Most of us would18that we feel good on some days and not so good on19; sometimes our ideas seem to flow and at other times, the20do not exist. | ||||
|
A、2, 6, 4
B、2, 5, 4
C、6,10, 5
D、10 ,5, 4
其中， cig pric表示每包香烟的价格(美分) ， 而restaur n表示一个二值变量， 并在这个人所定居的州有餐馆抽烟限制时等于1。假定这些变量对个人而言都是外生的，那么你预期y5和y6具有什么样的符号?
(iii)在什么样的条件下第(i)部分的收入方程可识别?
(iv)用OLS估计收入方程并讨论岛的估计值。
(v)估计cigs的约简型。(记住这就要求将cigs对所有外生变量回归。) log(cig pric) 和restaur n在约简型中显著吗?
(vi)现在用2SLS估计收入方程。讨论β1的估计值与OLS估计值的比较。
(vii)你认为香烟价格和餐馆抽烟限制在收入方程中是外生的吗?
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