以下属于光学方式存储信息的设备的是（）。A、软盘 B、硬盘 C、DVD D、CD

若9×3^m=81，m=( )

某男，55岁，患低丙种球蛋白血症，入院做血型鉴定，正反定型不符（试管法），正定型：抗A+，抗B－，抗AB+。反定型：Ac－，Bc－，Oc－。镜下观察为缗钱状凝集。继续做自身对照不凝集，抗体筛查阴性，吸收放散试验测定含A抗原，唾液中血型物质也含A物质，最后确定血型为A型。该患者正反定型不符的原因为（）。

A.串钱状假凝集

B.抗原减弱

C.ABO抗体丢失

D.多次输血

E.免疫球蛋白的干扰

阅读理解。

     Children, especially boys, tend to idealize their fathers when they are young. Every little boy wants

to grow up to be just like his father, and every little girl thinks her father is the smartest man on the

earth. It's not very easy to be a good father, but it's not that difficult either. Children will truly enjoy

spending time with their fathers, not just when they are kids, but even when they are adults.

     Not all children communicate well with their fathers. Communication is often left to mothers, while

fathers dispense advice as and when necessary. Don't expect all conversations to center around the

dinner table. Go to your children's bedrooms and talk to them about school, their teachers or their

friends. Remember that the conversation cannot be one-sided. When your children open up to you,

you also need to open up to them.

    If your children come home from school feeling upset, go up to them and ask them what is the

matter And if it is something which seems to you to be a silly reason to be upset, don't voice your

opinion. It may be silly to you, but to your children it is important enough. So don't wave the topic

away by telling them not to bother about such stupid things. Simply discussing their problems with

them will help them feel better.

    Don't shy away from having discussions about your teenage children's love lives. Generally speaking,

your children are definitely not going to discuss intimate details with you. Try to let them know that

you are relaxed about topics on love. ell your children how you met your wife. It is perfectly normal

for children to go through feelings for the opposite sex as they grow up, and by keeping the topic

closed for discussion, you are only shutting them off from discussing their feelings with you. All they

will do is turn to their friends.

1.To children their fathers are usually very _____.

A. kind    

B. great    

C. serious      

D. strong

2.From the second paragraph we can know that _____.

A .some children don't like their fathers at all

B. talking with children around the dinner table is unnecessary

C.it is better for fathers to communicate more with their children

D. mothers should communicate less with their children.

3.Suppose your children are worried about something you should _____.

A. have a talk with them        

B. express your opinion

C .keep silent                

D. let them alone

4.Which of the following has the closest meaning to the underlined word "intimate" in Paragraph 4?

A. public    

B. personal    

C. strange    

D. serious

用来连接轴上零件的机械装配是（）。

A．齿轮

B．滑动轴承

C．滚动轴承

D．键

工作任务单，指派过工作负责人后状态有何变化？