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【单选题】
下列哪项不属于持久性有机污染物的特殊毒性A.
对免疫系统的毒性
B.
对内分泌系统的危害
C.
致癌作用及引起其他器官组织的病变
D.
对上呼吸道的危害
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举一反三
【单选题】Which statement about entering into a tank which has been sealed for a long time is TRUE ________．
A.
The tank should be tested only once to ensure the oxygen content is at least 14% before entry
B.
The tank must be tested at frequent intervals to ensure that hazardous gasses have not regenerated
C.
The tank need not be tested for oxygen content if it is ventilated for more than 24 hours
D.
If the oxygen content tests at less than 12% you should wear an approved gas mask
【多选题】Which statement is correct for the concept of the word?
A.
Every word is a unity of the form and the meaning.
B.
Word is a cluster of letters between two blanks.
C.
A word is the fundamental unit of sentence structure.
D.
As for its internal structure, a word is the most stable unit in a language.
【单选题】Which statement about buying things for yourself is true?
A.
You feel good for a long time.
B.
You feel good for a short time
【单选题】Which statement about sample collection for routine urinalysis is true?
A.
Preservative tablets should be used for collecting random urine specimens
B.
Containers may be washed and reused if rinsed in deionized H 2 0
C.
Samples may be stored at room temperature for up to 2 hours
D.
Random samples are acceptable when renal disease is suspected
【单选题】Which statement is not true for 2019-nCoV?
A.
It can spread through contact
B.
It can be killed by 75% alcohol
C.
The weakened immune system can be hardly infected
【单选题】Which statement is true for cellulose, but not true for protein?
A.
It is found in cell suce membranes.
B.
It is synthesised from identical sub-units
C.
It is used as an energy source.
D.
It may be a structural component.
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