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【单选题】
用特殊方法把固体物质加工到纳米级(1nm-100nm)的超细粉末粒子,然后制得纳米材料.下列分散系中的分散质的粒子的大小和这种纳米粒子大小具有相同的数量级的是( )A.
液
B.
浊液
C.
体
D.
浊液
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举一反三
【判断题】A study of packaging’s changing roles and forms over the centuries is really a study of the growth of civilization.
A.
正确
B.
错误
【简答题】以下程序段的输出结果是 。intx=2;do{printf("*");x--;}while(x);
【单选题】以下程序段输出的结果是( ) Stringstr="123"; intx=4; inty=5; str=str+(x+y); System.out.println(str);
A.
12345
B.
132
C.
1239
D.
编译时发生异常
【简答题】试述声波传入及产生听觉的途径(空气传导)。
【单选题】The Poison Prevention Packaging Act considered the safety of several special product packaging in 1970, such as mainly .
A.
radioactive and dangerous chemicals packaging.
B.
food and medical product packaging.
C.
industrial retail packaging.
D.
sanitary articles.
【单选题】Packaging It is said that the public and Congressional concern about deceptive packaging rumpus started because Senator Hart discovered that the boxes of cereals consumed by him, Mrs. Hart. and their ...
A.
this entails an increase in the cost of packaging
B.
they have to pay for the cost of changing package sizes
C.
the unit price for a product often rises as a result
D.
they hate to see any changes in things they 'are familiar with
【单选题】Which kind of packaging is directly contact with the contents?
A.
primary packaging
B.
secondary packaging
C.
transit packaging
D.
tertiary packaging
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