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【多选题】
能将醇羟基氧化为醛的试剂是( )A.
Jone’s 试剂
B.
CrO 3 - 吡啶
C.
O 2/ Pt
D.
铬酸
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举一反三
【判断题】In an open trading system, a country will import those commodities that it produces at relatively low cost while exporting commodities that can be produced at relatively high cost.
A.
正确
B.
错误
【简答题】计算节点位置的基本方法主要包括 ___________、____________、__________。
【单选题】A service that consumes a relatively low level of resources but is reported to have a relatively high cost may indicate:
A.
Product cost cross-subsidization
B.
Product marketing
C.
Product overcosting
D.
Product undercosting
【单选题】One of the reasons for the relatively high price of many drugs is the huge cost of ____and development.
A.
experiments
B.
research
C.
trials
【简答题】In electronicpower supplies there is often a need to isolate the output from the input andreduce the weight and cost of the unit. In other applications, such as inaircraft, there is a strong incentive...
【简答题】Pipelines offer the shipper an extremely high level of ______________ at a relatively low cost。
【简答题】在铁碳合金中一共有三个相,即铁素体、( )和渗碳体。
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