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当前学科：证券投资分析
题目：
单选题
如果一种债券的市场价格下降，其到期收益率必然会（）。
A
不确定
B
不变
C
下降
D
提高
答案：
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杆上避雷器排列整齐，接地侧引线铜线截面积不小于（）mm2。
制动机的压力开关是利用上下气室的（），控制（）动作以实现对相应电路的控制。
Camping Camping wild is a wonderful way to experience the natural world and， at its best， it makes little environmental influence. But with increasing numbers of people wanting to escape into the wilderness， it is becoming more and more important to camp unobtrusively （不引人注目地） and leave no mark. Wild camping is not permitted in many places， particularly in crowded lowland Britain. Wherever you are， find out about organizations responsible for managing wild spaces， and contact them to find out their policy on camping and shelter building. For example， it is fine to camp wild in remote parts of Scotland， but in England you must ask the landowner's permission， except in national parks. Camping is about having relaxation， sleeping outdoors， experiencing bad weather， and making do without modern conveniences. A busy， fully-equipped campsite （野营地） seems to go against this， so seek out smaller， more remote places with easy access to open spaces and perhaps beaches. Better still， find a campsite with no road access： walking in makes a real adventure. Finding the right spot to camp is the first step to guaranteeing a good night's sleep. Choose a campsite with privacy and minimum influence on others and the environment. Try to use an area where people have obviously camped before rather than creating a new spot. When camping in woodland， a void standing dead trees， which may fall on a windy night. Avoid animal runs and caves， and possible homes of biting insects. Make sure you have most protection on the windward side. If you make a fire， do so downwind of your shelter， always consider what influence you might have on the natural world. Avoid damaging plants. A good campsite is found， not made — changing it should be unnecessary. ometimes you need to make electricity.（）
尿管型常用防腐剂（）
局部损失发生在管路的哪一个部分中？
需要缴纳税款的纳税人出境前未结清应纳税款，又不提供担保的，税务机关可以通知出境管理机关阻止其出境。（）
对脾血管瘤的描述不包括（）。
在回归直线i=a+bx中，若b＜0，则有（）。
血站出售无偿献血血液的，由县级以上地方人民政府卫生行政部门按照《献血法》第（）条的有关规定，予以处罚；构成犯罪的，依法追究刑事责任。
下列各项属于地籍主要研究内容的有（）。