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【简答题】
为昏迷病人口腔护理用开口器时应 A. 从门齿处放入 B. 从尖齿处放入 C. 从臼齿处放入 入 D. 从双唇处放入 E. 从上下腭处放
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举一反三
【单选题】Economic models
A.
are essentially different from those used in other sciences.
B.
always use graphs.
C.
simplify reality.
D.
include all relevant facts.
【单选题】We can infer that current virtual reality devices ______.
A.
still need improving to create a perfect virtual world
B.
are already perfect to create a virtual world
C.
are unable to create a virtual world
D.
are harmful to users of virtual reality
【单选题】Traditional economic models found it hard to explain the phenomenon of .
A.
search frictions
B.
unemployment
C.
labor as commodity
D.
wage falls
【单选题】Economic models
A.
are people who act out the behavior of firms and households so that economists can study this behavior.
B.
are usually detailed replications of reality.
C.
incorporate simplifying assumptions that often contradict reality, but also help economists better understand reality.
D.
are useful to researchers but not to teachers because economic models omit many details of the real-world economy.
【单选题】Economic models
A.
cannot be useful if they are based on false assumptions.
B.
were once thought to be useful, but that is no longer true.
C.
must incorporate all aspects of the economy if those models are to be useful.
D.
can be useful, even if they are not particularly realistic.
【单选题】Economic models
A.
are not useful because they omit many real-world details.
B.
are usually composed of diagrams and equations.
C.
are useful because they do not omit any real-world details.
D.
contribute very little to economists’ understanding of the real world.
【单选题】Some child ren stated that they used their unsupervised free time to perfec t their athletic skills, such as playing basketball
A.
GemmaGemma spent hours trying to perfect her technique spent hours trying to perfect her technique
B.
The treaty is far from perfect, but it is clearly the way forward.
C.
In English, the perfect is formed with "have" and the past participle of the verb.
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