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等同学以“串场河水污染情况调查”为研究性课题，请你参与他们的研究，回答以下（1）～（4）小题． （1）为较准确地测定河水样品的酸碱度，你建议使用______（填序号）． A．紫色石蕊试液    B．蓝色石蕊试液    C．无色酚酞试液    D．pH试纸 （2）通过网上查询，得知用于测定磷含量的试剂是钼酸铵[化学式为 （NH 4 ） 2 MoO 4 ]，问钼酸铵中钼（Mo）元素的化合价是______． （3）以下几种研究方案中，你认为不恰当的是______（填序号）． A．请教专家、老师后，进行氮、磷、钾等元素含量的测定 B．考虑到沿河建有硫酸厂，拟用氯化钡和稀硝酸检验河水中是否含有硫酸根离子 C．只到串场河上游取水样进行研究 D．调查沿河生活污水、工厂废水及化肥农药的使用情况 （4）研究报告里提出了以下设想，你认为不合理的是______（填序号）． A．禁止沿河工厂将未经处理的污水向河流中直接排放 B．城市生活污水要经净化处理达标后才能排放 C．指导农民科学合理地使用化肥、农药 D．在河流中投放化学试剂使氮、磷、钾转化为不溶物沉降．
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举一反三
【单选题】Read the paragraph below. Choose and write the best topic sentence for each paragraph on the line provided. __________________________________________________________ . There are some private colleges...
A.
Two main types of colleges and universities in the United States are private and public.
B.
Private colleges and universities get money from taxes.
C.
There are only some colleges and universities in the United States.
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【单选题】日本血吸虫主要寄生于人体的哪一部位
A.
肝脏
B.
肠壁
C.
肺部
D.
肠系膜下静脉和门静脉系统
E.
肠系膜上静脉
查看完整题目与答案
【单选题】The relationship between some colleges and retirement communities is ______.
A.
similar in that there are more females than males
B.
opposite in that females perform. better in colleges while males better in retirement communities
C.
similar in that females perform. better than males
D.
opposite in that there are more females than males in colleges
查看完整题目与答案
【单选题】华支睾吸虫成虫主要寄生于人体
A.
肝脏内
B.
胰腺管内
C.
胆总管内
D.
肝胆管内
E.
胆囊内
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【单选题】华支睾吸虫主要寄生于人体的( )
A.
十二指肠
B.
结肠
C.
胆总管
D.
肝内胆管
E.
胰管
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【单选题】华支睾吸虫主要寄生于人体（）
A.
胆囊
B.
外胆管
C.
胰腺导管
D.
肝内胆管
E.
门静脉-肠系膜系统
查看完整题目与答案
【单选题】According to the passage, in competing for talented students, some colleges offer to ______.
A.
raise financial aid
B.
cut tuitions by half
C.
pay full tuition
D.
raise academic quality
查看完整题目与答案
【单选题】日本血吸虫主要寄生于人体的
A.
肠系膜动脉
B.
肾静脉
C.
下腔静脉
D.
门脉-肠系膜静脉系统
E.
肝静脉
查看完整题目与答案
【单选题】What is the controversy revealed in the passage?
A.
Some colleges change into university, and the opposite is also true.
B.
Some universities advertise their collegelike atmosphere, while some colleges tell potential applicants that they are just like universities.
C.
Some colleges change into university, and some universities into institute.
D.
Some private colleges change into universities and schools at the same time.
查看完整题目与答案
【多选题】下列关于约当产 量比例法的说法中,正确的有 ( ) 。
A.
这种方法适用于各月月末在产品数量较多，各月在产品数量变化也较大，直接材料成本在生产成本中所占比重较大且材料在生产开始时 - 次就全部投入的产品
B.
各工序产品的完工程度可事先制定，产品工时定额不变时可长期使用
C.
如果材料是在生产开始时一 次性投入的，无论在产品的完工程度如何，都应与完工产品负担同样材料成本
D.
如果材料是随着生产过程陆续投入的 , 则应按照各工序投入的材料成本在全部材料成本中所占的比例计算在产品的约当产量
查看完整题目与答案
相关题目：
【单选题】Read the paragraph below. Choose and write the best topic sentence for each paragraph on the line provided. __________________________________________________________ . There are some private colleges...
A.
Two main types of colleges and universities in the United States are private and public.
B.
Private colleges and universities get money from taxes.
C.
There are only some colleges and universities in the United States.
查看完整题目与答案
【单选题】日本血吸虫主要寄生于人体的哪一部位
A.
肝脏
B.
肠壁
C.
肺部
D.
肠系膜下静脉和门静脉系统
E.
肠系膜上静脉
查看完整题目与答案
【单选题】The relationship between some colleges and retirement communities is ______.
A.
similar in that there are more females than males
B.
opposite in that females perform. better in colleges while males better in retirement communities
C.
similar in that females perform. better than males
D.
opposite in that there are more females than males in colleges
查看完整题目与答案
【单选题】华支睾吸虫成虫主要寄生于人体
A.
肝脏内
B.
胰腺管内
C.
胆总管内
D.
肝胆管内
E.
胆囊内
查看完整题目与答案
【单选题】华支睾吸虫主要寄生于人体的( )
A.
十二指肠
B.
结肠
C.
胆总管
D.
肝内胆管
E.
胰管
查看完整题目与答案
【单选题】华支睾吸虫主要寄生于人体（）
A.
胆囊
B.
外胆管
C.
胰腺导管
D.
肝内胆管
E.
门静脉-肠系膜系统
查看完整题目与答案
【单选题】According to the passage, in competing for talented students, some colleges offer to ______.
A.
raise financial aid
B.
cut tuitions by half
C.
pay full tuition
D.
raise academic quality
查看完整题目与答案
【单选题】日本血吸虫主要寄生于人体的
A.
肠系膜动脉
B.
肾静脉
C.
下腔静脉
D.
门脉-肠系膜静脉系统
E.
肝静脉
查看完整题目与答案
【单选题】What is the controversy revealed in the passage?
A.
Some colleges change into university, and the opposite is also true.
B.
Some universities advertise their collegelike atmosphere, while some colleges tell potential applicants that they are just like universities.
C.
Some colleges change into university, and some universities into institute.
D.
Some private colleges change into universities and schools at the same time.
查看完整题目与答案
【多选题】下列关于约当产 量比例法的说法中,正确的有 ( ) 。
A.
这种方法适用于各月月末在产品数量较多，各月在产品数量变化也较大，直接材料成本在生产成本中所占比重较大且材料在生产开始时 - 次就全部投入的产品
B.
各工序产品的完工程度可事先制定，产品工时定额不变时可长期使用
C.
如果材料是在生产开始时一 次性投入的，无论在产品的完工程度如何，都应与完工产品负担同样材料成本
D.
如果材料是随着生产过程陆续投入的 , 则应按照各工序投入的材料成本在全部材料成本中所占的比例计算在产品的约当产量
查看完整题目与答案