用脉动法可以量测结构的动力特性。对于脉动法,下列叙述不正确的是()。A、脉动法的振源

题型:单项选择题

问题:

用脉动法可以量测结构的动力特性。对于脉动法,下列叙述不正确的是()。

A、脉动法的振源来自风、城市的车辆、施工设备及远处的地震和附近地壳的内部破裂,因此引起结构的振动振幅极小

B、由于以上原因其振源的大小是不规则的,随机的

C、从试验方法讲属于环境激振

D、这种试验方法只能测出结构的基频,得不到高阶振型及频率等参数

考点:一级注册结构工程师一级结构师基础知识一级注册结构工程师基础部分下午试卷
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一直不透明的口袋中放有若干只红球和白球,这两种球除了颜色以外没有任何其他区别,将袋中的球摇均匀.每次从口袋中取出一只球记录颜色后放回再摇均匀,经过大量的实验,得到取出红球的频率是
1
4
,求:
(1)取出白球的概率是多少?
(2)如果袋中的白球有18只,那么袋中的红球有多少只?
题型:单项选择题

尖锐湿疣的病原体是()。

A.水痘-带状疱疹病毒

B.单纯疱疹病毒

C.人 * * 瘤病毒

D.科萨奇病毒

E.HIV

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SQL支持集合的并运算,在Visual FoxPro中SQL并运算的运算符是【 】。

A.PLUS

B.UNION

C.+

D.∪

题型:单项选择题

E  

Many children first learn the value of money by receiving an allowance. The purpose is to let children learn from experience at an age when financial mistakes are not very costly.

The amount of money that parents give to their children to spend as they wish differs from family to family. Timing is another consideration. Some children get a weekly allowance. Others get a monthly allowance.

In any case, parents should make clear what, if anything, the child is expected to pay for with the money. At first, young children may spend all of their allowance soon after they receive it. If they do this, they will learn the hard way that spending must be done within a budget. Parents are usually advised not to offer more money until the next allowance.

The object is to show young people that a budget demands choices between spending and saving. Older children may be responsible enough to save money for larger costs, like clothing or electronics. Many people who have written on the subject of allowances say it is not a good idea to pay your child for work around the home. These jobs are a normal part of family life.

Paying children to do extra work around the house, however, can be useful. It can even provide an understanding of how a business works.

Allowances give children a chance to experience the three things they can do with money. They can share it in the form of gifts or giving to a good cause. They can spend it by buying things they want. Or they can save it.

Saving helps children understand that costly goals require sacrifice: you have to cut costs and plan for the future. Requiring children to save part of their allowance can also open the door to future saving and investing. Many banks offer services to help children and teenagers learn about personal finance. A savings account is an excellent way to learn about the power of compound interest.

Compounding works by paying interest on interest. So, for example, one dollar invested at two percent interest for two years will earn two cents in the first year. The second year, the money will earn two percent of one dollar and two cents, and so on. That may not seem like a lot. But over time it adds up.

77.For children who receive allowances, they’d better not ________.  

A. waste money to buy gifts for their parents or friends  

B. buy their favorite clothing or electronics for themselves  

C. save money like their parents or other adults  

D. ask for the next allowance before the decided date.

78.Many parents give children an allowance regularly to ______.  

A. meet children’s basic need for life       

B. give control over their children  

C. see whether they have financial mistakes  

D. help children learn how to manage money

79.If children are required to save their allowance, they ______.  

A. can experience three things related to money  

B. can understand the relation between goals and sacrifice  

C. will do more work around the house  

D. help themselves found the basis for their future life

80. What is the best title for the passage?

A. Be Generous to Pay Your Children

B. Be Wise to Avoid Financial Mistakes

C. Saving Allowances Does Good to Children

D. Allowances Help Children Learn about Money

题型:单项选择题

1840年英国引航公会将汽船航行规则纳入()的规定。

A、推荐航路

B、汽船在狭水道靠右航行

C、汽船在狭水道单向航行

D、双向航路

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