【单选题】在外文数据库中使用“ oil ” 和“ economic ” 进行检索,以下哪种检索式检索结果最多? ( )
C.
Title = oil and economic
D.
Title = oil and Abstract = economic
【单选题】客观事物总是在不停地运动和变化,而信息则存在于客观事物的运动和变化之中,这决定了信息具有 ________ 。
【单选题】If foreign manufacturers cut manufacturing costs and profit margins in response to a depreciation in the U.S. dollar, the effect of these actions is to:
A.
Shorten the amount of time in which the depreciation leads to a smaller trade deficit
B.
Shorten the amount of time in which the depreciation leads to a smaller trade surplus
C.
Lengthen the amount of time in which the depreciation leads to a smaller trade deficit
D.
Lengthen the amount of time in which the depreciation leads to a smaller trade surplus
【单选题】有28瓶水,其中27瓶质量相同,另有1瓶是盐水,比其他的水略重一些,至少称( )次能保证找出这瓶盐水。
【多选题】一国对外贸易地理方向通常受下列哪些因素的影响