影响样本容量的因素有（）。A.总体规模的大小 B.总体的内部差异程度 C.精确度要求

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两处为多余选项。

  1   First, the radioactive material must travel from its place of production to the power station. Although the power stations themselves are strongly built’, the ．containers used for the transport of the materials are not． 2 Unfortunately, both’ of these may have an effect on the general public, since they are sure to pass near, or even through heavily populated areas．

Second, there is the problem of waste．  3  It is impossible to make these wastes non—radioactive, and so they must be stored in one of the inconvenient ways ．that scientists have invented．For example? they may be buried under the ground, or dropped into deserted mines, or sunk in the sea．However, these methods do not ’solve the problem, since an earthquake could easily break the containers．

Third, there may occur the danger of a leak or an explosion at the power station．As with the other two dangers, this is not very likely to take place． 4  However, it can happen．

Separately, these three types of dangers are not a great cause for worry．  5 

A．It is unusual for radioactive materials to be transported across land．

B．There are three separate sources of danger in supplying energy by nuclear power．

C．All nuclear power stations produce wastes that in most cases will remain radioactive for thousands of years．

D．The general public are strongly against the nuclear program． E．So it does not provide a serious objection to the nuclear program．

F．Normally, only two methods of transport are in use, namely road or rail．

G．But when they are taken together, the probability of disaster is extremely high．

下表为元素周期表的一部分，请参照元素①一⑧在表中的位置，回答下列问题

（1）②、③、⑦的最高价含氧酸的酸性由强到弱的顺序是________________（写化学式）。

（2）由表中元素可以组成多种漂白剂，试写出其中两种常用漂白剂的化学式：_________、_______。

（3）①、④、⑤三种元素形成的化合物中化学键的类型：____________________。

（4）②和④形成的化合物与④和⑤形成的化合物之间发生氧化还原反应，写出该反应的化学方程式：

_________________________。

（5）由表中元素形成的常见物质X、Y、Z、M、W可发生以下反应：

①X溶液与Y溶液反应的离子方程式为_____________________；

②已知M为硝酸盐，则M溶液中各离子浓度由大到小排列顺序为：

c（_____）>c（_____）>c（_____）>c（_____）（在括号内填离子符号）。

土地证书中的附图是( )。

A．权属界线图
B．宗地草图
C．宗地图
D．土地利用现状图

建设工程质量管理的PDCA循环中，质量管理的计划职能是（）。

A．明确目标并制定实现目标的行动方案

B．根据质量管理计划进行行动方案的部署和交底

C．对计划实施过程进行各种检查

D．对质量问题进行原因分析，采取措施予以纠正

杏苏散的功用是（）

A.养阴清肺，解毒利咽

B.清燥润肺，养阴益气

C.滋养肺肾，止咳化痰

D.清宣温燥，润肺止咳

E.轻宣凉燥，理肺化痰