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【简答题】
在国际贸易中通过汇票、发票、提单、信用证等商业文件的交接进行结算支付并履行合同的贸易( )
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皮皮学刷刷变学霸
举一反三
【简答题】系统采用控制分散、操作和管理集中的基本设计思想,其主要特征就是集中管理和分散控制。
【多选题】关于引物设计说法正确的是( )
A.
为保证PCR反应的特异性,所设计的引物长度一般>30个核苷酸
B.
引物设计时G+C含量在引物中一般为45~55﹪
C.
按经验,引物自身存在的连续互补序列一般不超过3个碱基
D.
两个引物之间不应存在互补序列,尤其避免3’端的互补重叠
E.
引物的3‘端可以游离而不影响PCR反应的进行
【简答题】( )是指某一随机事件在样本中出现的机会。
【单选题】A scientist who wants to predict the way in which consumers will spend their money must study consumer behavior. He must obtain 【C1】______ both on resources of consumers and on the motives that 【C2】__...
A.
data
B.
materials
C.
money
D.
things
【简答题】Most consumers were satisfied with the way their complaints (handle) _____________ by the company last week.
【单选题】A scientist who wants to predict the way in which consumers (消费者) will spend their money must study consumer behavior. He must obtain data both on the resources of consumers and on the motives that te...
A.
rely on traditional assumptions about earning and spending
B.
try to encourage or discourage consumers to spend money
C.
carry out investigations on consumer behavior. and get data on consumers incomes and money spending motives
D.
do researches in consumer psychology in a laboratory
【简答题】A scientist who does research in economic psychology and who wants to predict the way in which consumers will spend their money must study consumer behavior. He must obtain data both on the resources ...
【单选题】下列关于定量PCR引物设计的原则中，不正确的是
A.
两条引物的 Tm 值相差尽量大
B.
尽量避免引物二聚体的出现
C.
反应体系中引物的浓度一般在 0.1~0.2μmol/L 之间
D.
引物过长可能提高退火温度
【单选题】A scientist who wants to predict the way in which consumers will spend their money must study consumer behavior. He must obtain 【C1】______ both on resources of consumers and on the motives that 【C2】__...
A.
data
B.
materials
C.
money
D.
things
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