全口义齿咬合形式与天然牙咬合形式的主要区别是（） A．前伸 B．侧向 C．平衡 D．

Why must we pay taxes The answer is that the government needs money for many things, for example, to pay its soldiers, sailors and airmen, to build roads, bridges, offices, schools, etc, and to buy goods from abroad ; and only the people of the country can supply the money. One of the most important taxes is income-tax which a person pays according to the amount of his income, whether he is a merchant, a doctor, a lawyer, a shopkeeper, a miner or anything else. This is called a "direct" tax, because it is paid in money directly to the government. Another tax is paid on goods such as watches, jewelry, new clothes, tobacco, wine, etc, when they are brought into a country. Such a tax is paid as part of the price of these goods if they are late sold in shops. We call it "indirect" tax, because it is paid indirectly through the shopkeepers. People usually complain about having to pay taxes, but they forget that the money is spent on things that they and their families need. We need policemen to catch thieves, to see that men obey the laws, to direct traffic, etc, and they must be paid what they earn; children need education, and there must be schools and teachers; we want our streets to be kept clean, and the wages of men who do this kind of work have to be paid. Above all, the country must always be ready to defend itself against attacking enemies, and we can’t have an army without paying for it. Besides, if a country wants to develop, there are many other things to do... Taxes, therefore, cannot be avoided. We buy our food and clothes and pay for our amusements; but, there are several things that the State finds the money for, and that is necessary for us if our society is to continue. We have no real reason to complain, therefore, when we are asked to supply money to be spent for the good of ourselves and for our fellow-citizens.

易发生缺血性坏死的骨折是（）。

A.骨盆骨折

B.肱骨髁上骨折

C.股骨颈骨折

D.锁骨骨折

E.Colles骨折

改革户籍制度已经成为某市当前社会改革的重要内容之一，其要点就是放宽对外来人口的限制。但决策者却面临两难，一方面他们懂得吸引外来人口对加快该市城市化进程有着重要意义，另一方面又担心人口激增会带来许多压力。因此在决策班子里形成了“开放”和“保守”两种意见。
下列各项如果是真的，都只能支持上述某种意见，除了( )。

A．“二元化”的户籍制度，已经严重不适应目前社会经济发展需要
B．由于计划生育政策和生育观念的转变，该市近年来幼儿园和中小学数量递减
C．该市现有的交通、教育等基础条件和服务设施，不能满足其城市人口扩容的需要
D．据该市公安部门统计，近年来该市犯罪案件增加，案犯中来自流动人口的比例提高

《洛迦诺公约》规定：德、比、法、英、意相互保证维护《凡尔赛和约》所规定的德法和德比之间的边界现状。在当时条件下这一规定的最大受益国是( )。

A．德国
B．英国
C．比利时
D．法国

测量水平振动值时，应选在轴承宽度中央的（）为测点。

A.上方

B.下方

C.中分面稍下

D.任何位置