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单选题 下列化合物中,能区分芳香醛和脂肪醛的试剂是( )
学科：默认课程
时间：2025-12-24 19:50:40
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题目1单选题
In-flight ice distroys the smooth flow of air, increasing _____ while decreasing the ability of the airfoil to creat ______A. drag; liftB. lift; dragC. weight; thrustD. thrust; weight
题目2单选题
In-flight ice distroys the smooth flow of air, _____ drag while _______ the ability of the airfoil to creat liftA. increasing; increasingB. decreasing; decreasingC. increasing; decreasingD. decreasing; increasing
题目3单选题
When the aircrew determines curcunavigation is possible, they merely _____the course to take them around the stormA. alterB. alternateC. alternativeD. altimeter
题目4单选题
Thunderstorms produce some of the most dangerous weather elements in aviation and you should avoid _______ themA. penetratingB. to penetrateC. penetrateD. penetrated
题目5单选题
Thunderstorms progress three definite stages-cumulus, mature and ______A. dispersingB. dissipatingC. dispellingD. distracting
题目6单选题
The distance by which an aircraft avoids obstacles or other aircraft is termed _______A. separationB. operationC. preparationD. precipitation
题目7单选题
There are three conditions necessary to create a thunderstorm: air that has a tendency towards ____ some types of lifting action, and relatively high moisture contentA. stabilityB. instabilityC. stableD. unstable
题目8单选题
when air crew determines circumnavigation is possible, they merely _____ the course to take them around the thunderstormA. continueB. alterC. alternateD. alternative
题目9单选题
下列化合物中,能区分芳香醛和脂肪醛的试剂是( )A. 斐林试剂B. 高锰酸钾溶液C. 托伦试剂D. 希夫试剂
题目10单选题
下列关于酮的说法中错误的是A. 酮的通式为R1COR2B. 酮能发生银镜反应C. 丙酮是最简单的酮D. 酮的官能团是羰基(C=O)
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