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【判断题】
Because the total concentration of a polluting element in an environmental sample provides no information concerning the fate of the element in terms of its interaction with sediment, its ability to cross biological membranes, or its resultant toxicity of a metal. Changes in speciation may dramatically affect the toxicity of a metal. Thus, in order to assess the environmental impact of an element, we must have some information concerning its speciation.
A.
正确
B.
错误
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参考答案:
举一反三
【判断题】构造CLOS网络的目的是寻求一种交叉点数随入、出线数增长较慢的交换网络。()
A.
正确
B.
错误
【判断题】一行中不能有多于一个的项目编号。
A.
正确
B.
错误
【单选题】下列哪项不属于疫源地消灭的条件之一
A.
传染源被移走(住院或死亡)或不再排出病原体(痊愈)
B.
通过各种措施消灭了传染源排到外界环境中的病原体
C.
所有的易感接触者经过了该病的最长潜伏期未出现新病例
D.
所有的易感接触者经过了该病的最长潜伏期被证明未受感染
E.
所有的易感接触者经过了该病的最长传染期未出现新病例
【单选题】小儿肺炎喘嗽与咳嗽的鉴别要点().
A.
咳嗽剧烈
B.
气急鼻煽
C.
高热不退
D.
痰涎壅盛
E.
大便干结
【判断题】一行中不能有多于一个的项目编号。( )
A.
正确
B.
错误
【多选题】下面哪些产品属于CLOS架构的交换机()。
A.
S10500
B.
CE12800
C.
S12700
D.
N7000
【简答题】析下列材料 , 回答下列问题。 材料: 新华网北京 5 月 28 日电 国家卫生计生委发布通报称 , 广东出现首例输入性中东呼吸综合征 (MERS) 疑似病例。据美国和沙特研究人员报告 , 引起该病的冠状病毒广泛存在于骆驼体内 , 因此专家建议饲养或屠宰骆驼的人要戴上防护面罩、手套 , 并穿上防护衣 , 勤洗手 , 骆驼奶要加热饮用 , 骆驼肉也要烹饪熟再吃。 (1) 材料中的冠状病毒没有细胞结构...
【单选题】______ the government argees to give extra money,the theatre will have to be closed next month.
A.
Unless
B.
If
C.
Since
D.
As
【判断题】Word一行中不能有多于一个的项目编号。
A.
正确
B.
错误
【单选题】According to the Spanish researchers, which of the following statements is true?
A.
The closer you are to a mobile phone, the greater your exposure to electromagnetic radiation.
B.
The closer you are to a mobile phone that is being used to send and receive signals, the greater your exposure to electromagnetic radiation.
C.
The amount of electromagnetic radiation reflected by metal is almost too small to be measured.
D.
You shouldn't stand close to people who are using their mobile phones in train carriages, buses, and lifts.
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