在标准状态下，1L液氧汽化后为（）L气氧。A、640 B、800 C、770 D、5

Every childwants to have pocket money(零花钱). Why do their parents just give them some money?  小题1: 

The amount of money that parents give to their children differs from family to family.   小题2:   Some children get weekly pocket money. Others get monthly pocket money.

First of all, children are expected to make a choice between spending and saving. Then parents should make the children understand what they expect their children to buy with the money. At first, some young children may spend all of the money soon after they receive it. Parents are usually advised not to offer more money until it is the right time.    小题3: 

In order to encourage their children to do some housework, some parents give pocket money if the children help around the home. Some experts(专家) think it not wise to pay the children for doing that.    小题4: 

Pocket money can give children a chance to experience the three things they can do with the money. They can spend it by giving it to a good cause. They can spend it by buying things they want.   小题5: Saving helps children understand that costly goals require sacrifice. Saving can also open the door to future saving and investing for children.

A．Some children are not good at managing their pocket money.

B．As helping at home is a normal part of family life.

C．Learning how to get money is very important for every child.

D．By doing so, these children will learn that spending must be done with a budget（预算）.E .Timing is another consideration.

F .They can save it for future use.

G .One main purpose is to let kids learn how to manage their own money.

添加适宜适量的电解质使混悬液中的微粒形成疏松聚集体的过程称为（）

A.分层

B.破裂

C.起昙

D.转相

E.絮凝

彩色多普勒血流成像在检测腹部血流时，常有彩色信号闪烁现象，如何减轻或消除这种干扰

A．减低滤波频率

B．减低测速度的速度标尺，增大取样框

C．屏住呼吸，提高滤波频率

D．降低速度标尺

E．深呼吸，提高速度标尺

对于CVT患者，临床可选用的检查是（）

A.腰穿检查

B.X线头颅平片

C.头CT扫描

D.MRI+MRV

E.DSA

电梯的安全性和可靠性是个系统工程，它是由哪些方面来保证的？