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【简答题】
欧美国家已经开始了食品专用纸的研究与生产,并且已领先了一步。如全新的PLMEX食品专用纸,100%纯纸浆,不含荧光剂和危害人体的化学物质,具有防水、防油、抗粘、耐热的特点,使用方便,清理简单,安全卫生,符合美国FDA和德国BGA食品卫生标准、这种食品专用纸使用后清洗又可回收,并可反复使用50次。食品纸有成卷的,也有压制成各种纸杯形状的,不管是用于蒸制还是烘烤、微波加热,都不会变形和褪色。 在食品专用纸中,亟须开发的还有食品保温包装纸。这种纸所应具备的功能,是能将熟食包装后保持香、鲜、热度,供人们在不同的场地和时间方便地食用,以适应当今人们生活快节奏的需求。这种保温纸的原理是像太阳能集热器一样,能够将光能转化为热能。通常人们只需把这种特制的纸放在阳光能照射的地方,该纸所包围的空间就会不断有热量补充进去,从而使纸内的食物保持一定的热度,以便人们随时吃到香热适口的美食。如何提高食品包装的品质?
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【判断题】制定维修工艺文件时,要有详细的操作步骤,例如拆装的具体步骤是什么,先拆什么,后拆什么,安装时的位置和方向要求等等都要写明。
A.
正确
B.
错误
【单选题】Which one is correct about probability sampling?
A.
A given size of the sample in simple random sample  is drawn with the help of a ordered number chart.
B.
Sample members from a larger population are selected according to a random starting point but with a fixed, periodic interval in systematic sampling.
C.
The sample size for each sub-group can be unfixed to get representative sample in stratified Random Sample.
D.
Some of elements of selected groups is sampled and studied in one-stage cluster sampling.
【简答题】画出变压器的“T”形、近似和简化等效电路图?
【简答题】The clauses in this sentence are marked (a) and (b), decide which one is the premise(s) and which one is the conclusion in its an argument. (a) A good society treasures its dissidents and maver...
【单选题】About the knee joint, which one is incorrect?
A.
It is the largest and most complicated joint in the body.
B.
It is formed by the joints among femur, tibia, fibula and patella.
C.
The anterior cruciate ligament arises in front of the intercondylar eminence of the tibia.
D.
The medial meniscus is larger and less curved than the lateral meniscus.
【简答题】画出变压器的 “T”形、近似和简化等效电路。
【单选题】In the 2SLS estimation, which one is incorrect?
A.
The number of instrumental variables must be larger than or equal to the number of endogenous variables.
B.
Every instrumental variable must be correlated with every endogeneous variable.
C.
The 2SLS estimator is consistent under regularity conditions in Chapter 7, though its asymptotic variance may be larger than the OLS estimator.
D.
must be finite and of full rank to ensure that the 2SLS estimator is well-defined.
【简答题】要求:解题要有较详细的解题过程及步骤,图像要画出来, 数学分析作业4.docx
【单选题】Which one is larger?
A.
The top part
B.
The lower part
【简答题】画出变压器的“T”形、近似和简化等效电路
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