为以后的工序提供定位基准的阶段是（）。A、粗加工阶段 B、半精加工阶段 C、精加工阶

患者，男性，30岁，游离缺失，患者要求行固定义齿修复，欲采用单端固定桥修复，需要满足的最好条件是（）

A．以第二前磨牙和第一磨牙为基牙

B．基牙牙周状况良好

C．缩小的近远中径

D．缩小的颊舌径

E．以上均是

阅读理解。

     Have you ever wondered why birds sing? Maybe you thought that they were just happy. After all,

you probably sing or whistle when you are happy.

     Some scientists believe that birds do sing some of the time just because they are happy. However,

they sing most of the time for a very different reason. Their singing is actually a warning to other birds to

stay out of their territory.

     Do you know what a "territory" is? A territory is an area that an animal, usually the male, claims as its

own. Only he and his family are welcome there. No other families of the same species are welcome.

Your yard and house are your territory where only your family and friends are welcome. If a stranger

should enter your territory and threaten you, you might shout. Probably this would be enough to frighten

him away.

     If so, you have actually scared the stranger away without having to fight him. A bird does the same

thing. But he expects an outsider almost any time, especially at nesting season. So he is screaming all the

time, whether he can see an outsider or not. This screaming is what we call a bird's song, and it is usually

enough to keep an outsider away.

     Birds sing loudest in the spring when they are trying to attract a mate and warn others not to enter the

territory of theirs.

     You can see that birds have a language all their own. Most of it has to do with attracting mates and

setting up territories.

1. According to the passage, most of the time birds' singing is actually        .

A. an expression of happiness

B. a way of warning

C. an expression of anger

D. a way of greeting

2. What is a bird's "territory"?

A. A place where families of other species are not accepted.

B. A place where a bird may shout at the top of its voice.

C. An area for which birds fight against each other.

D. An area which a bird considers to be its own.

3. Why do birds keep on singing at nesting season?

A. Because they want to invite more friends.

B. Because their singing helps frighten outsiders away.

C. Because they want to find outsiders around.

D. Because their singing helps get rid of their fears.

4. How does the writer explain birds' singing?   

A. By comparing birds with human beings.

B. By reporting experiment results.

C. By describing birds' daily life.        

D. By telling a bird's story.

A省甲公司拟于2008年向欧盟出口钨粉80吨，2007年8月6日，甲公司向A省商务厅申请办理钨粉出口许可证，被告知钨产品出口配额由A省人民政府行政许可服务中心集中分配，甲公司于2007年8月13日向行政服务中心报送申请钨粉出口许可证材料。行政许可服务中心人员收取申请材料后告知甲公司，因申请出口许可证的企业较多，后续审查办证事项请甲公司等待电话通知，2007年8月30日，甲公司获悉A省人民政府已将该省2008年度钨粉出口配额全部分配给A省乙公司，遂前往行政许可服务中心质询，工作人员以甲公司申请材料不齐全及存在错误为由将申请材料退还给甲公司。请分析案例，回答以下问题：

（2008，74）下列关于甲公司行政复议申请的表述，正确的是（ ）。

A．行政复议机关对复议申请书进行初步审查的最长期限为10日

B．甲公司的行政复议申请必须采用书面形式

C．甲公司可以向全国人大常委会申请行政复议终局裁决

D．甲公司应当从知道具体行政行为之日起60日内申请行政复议

BSP的经验说明，开始进行BSP) 研究必须要首先得到下列哪些人员参与研究的承诺

A) 最高领导和某些最高领导部门
B) 参与实际开发的开发人员
C) 最高领导部门和开发人员
D) 企业的技术人员

计算题：已知某吸附分离装置的解吸剂流量为288吨/小时，剂油比1.6。试求吸附进料的流量。