【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?
【简答题】画出变压器的“T”形、近似和简化等效电路
【单选题】患者,男性,岁,血栓性闭塞性脉管炎,下列护理措施不正确的是( )