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【多选题】
鉴别葡萄糖与果糖，可采用的试剂是：A.
溴水
B.
间二苯酚+浓盐酸 （Seliwanoff反应）
C.
苯肼（成脎反应）
D.
α-萘酚（Molish反应）
E.
Tollens试剂
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【简答题】3-10图层样式中的_____________可以制作出图层的立体效果。
【简答题】使金属引起疲劳的是（）载荷。
【简答题】Photoshop中，图层样式中的_____________可以制作出图层的立体效果。
【简答题】内存储器由一个个存储单元组成,每个存储单元可存放若干个二进制位,8个二进制位被称作一个()。内存中的存储单元按一定顺序进行编号,每个单元所对应的编号称为该单元的(),在操作系统中,常把该单元对应的编号称为内存储器的()或()。
【简答题】内存储器由一个个存储单元组成,每个存储单元可存放若干个二进制位,8个二进制位被称作一个()。内存中的存储单元按一定顺序进行编号,每个单元所对应的编号称为该单元的(),在操作系统中,常把该单元对应的编号称为内存储器的()或()。
【单选题】A worldwide ban on the production of certain ozone-destroying chemicals would provide only an illusion of protection. Quantities of such chemicals, already produced, exist as coolants in millions of r...
A.
It is impossible to measure with accuracy the quantity of ozone-destroying chemicals that exist as coolants in refrigerators.
B.
In modern societies, refrigeration of food is necessary to prevent unhealthy and potentially life-threatening conditions.
C.
Replacement chemicals that will not destroy ozone have not yet been developed and would be more expensive than the chemicals now used as coolants in refrigerators.
D.
Even if people should give up the use of refrigeration, the coolants already in existing refrigerators are a threat to atmospheric ozone.
E.
The coolants in refrigerators can be fully recovered at the end of the useful life of the refrigerators and reused.
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