苏联教育家马卡连柯提出的“平行教育影响”的德育原则是指( ) A．正面教育与纪律约

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
The purpose of the testing phase of software development is not to (71) the absence of errors in the programs being tested, but rather to find as many errors as possible. This statement may seem to contradict one’s intuitive notion of a successful test of a piece of (72) ; however, a successful test is one in which errors have been found, net one in which no errors have been detected.
There are generally two kinds of testing method: human testing and machine testing. In most companies where systems are developed, the first testing that occurs is not machine testing, but rather the detection of errors through (73) , team efforts, referred to as walkthroughs and inspection. With these methods, the author of the program forms a group with others who represent programming expertise or who may be part of the project team.

A. most B. minimum C. maximum D. great deal

After code has been subjected to the manual testing described above, it is then machine test- ed. Again, the test cases are designed to detect the (74) number of errors. Incremental or integration testing occurs subsequent to unit testing. This means combing modules with those that have already been unit tested. The incremental approach not only tests the (75) of each module, but also the "rippling effects" of errors, and the interfaces among modules.

胸闷泛恶，彻夜不寐，大便秘结者，当用（）。

A.礞石滚痰丸

B.半夏秫米汤

C.琥珀多寐丸

D.保和丸

E.天王补心丹

______ scientists develop new ways of feeding the human race, the crowded conditions on earth will make it necessary for us to look for open space somewhere else.

A．Until

B．Since

C．Once

D．Even if

第四题    铜矿开采

    某拟建铜矿主要矿物成分为黄铁矿、黄铜矿。该矿山所在区域为低山丘陵，年平均降雨量1800mm，且年内分配不均。矿山所在区域赋存地下水分为第四系松散孔隙水和基岩裂隙水两大类，前者赋存于沟谷两侧的残坡积层和冲洪积层中，地下水水量贫乏，与露天采场矿坑涌水关系不大；后者主要赋存于矿区出露最广的千枚岩地层中，与露天采场矿坑用水关系密切。

    拟定的矿山开发方案如下：

        (1)采用露天开采方式，开采规模5000t/d。

        (2)露天采场采坑最终占地面积为50.3hm²，坑底标高-192m，坑口标高72m。采坑废石和矿石均采用汽车运输方式分别送往废石场和选矿厂。采坑废水通过管道送往废石场废水调节库。

        (3)选矿厂设粗碎站、破碎车间、磨浮车间、脱水车间和尾矿输送系统等设施。矿石经破碎、球磨和浮选加工后得铜精矿、硫精矿产品，产生的尾矿以尾矿浆(固体浓度25%)的形式，通过沿地表铺设的压力管道输送至3km外的尾矿库。尾矿输送环节可能发生管道破裂尾矿浆泄漏事故。

        (4)废石场位于露天采场北侧的沟谷，占地面积125.9hm²，总库容1400×10⁴m³，设拦挡坝、废水调节库(位于拦挡坝下游)和废水处理站等设施。废水处理达标后排入附近地表水体。

        (5)尾矿库位于露天采场西北面1.6km处的沟谷，占地面积99hm²，总库容3131×10⁴m³，尾矿浆在尾矿库澄清，尾矿库溢流清水优先经回水泵站回用于选矿厂，剩余部分经处理达标后外排。

        [问题]

给出废石场废水的主要污染物和可行的废水处理方法。

在测量高压电流各项电流时，电源头线间距离应在（）

A、150mm

B、300mm

C、350mm

D、400mm