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【单选题】
采用测量峰值吸收系数的方法代替积分吸收，下列说法正确的是？（ ）A.
发射线的中心频率等于吸收线的中心频率
B.
发射线的中心频率与吸收线的中心频率无关
C.
发射线的中心频率小于吸收线的中心频率
D.
发射线的中心频率大于吸收线的中心频率
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【简答题】为何双环庚二烯在光照和加热条件下的产物不同?
【多选题】混凝土配合比设计的基本要求是()。
A.
满足施工所要求的混凝土拌合物的和易性
B.
满足混凝土结构设计的强度等级
C.
满足耐久性要求
D.
节约水泥，降低成本
E.
保证养护条件
【单选题】What describes an accurate position that is NOT based on any prior position?
A.
Dead-recknoning position
B.
Estimated position
C.
Fix
D.
Running fix
【单选题】Blank (2)_____________
A.
In fact, it expects sales to companies with fewer than 25,000 make sure that the employees to account for nearly half SAP’s total software phrase you choose fits sales this year.
B.
They recently announced they had purchased Virsa System, a privately held supplier of regulatory compliance software.
C.
You just can’t do everything yourself if you want to remain competitive.
D.
Competition in the market is fierce and only the big players will survive.
E.
Since then, it has evolved from a small, regional enterprise into the global market leader in ERP software, employing more than 34,000 people.
F.
Kagermann was unimpressed with Oracle’s appetite for big, headline-grabbing acquisition (People Soft Siebel System).
G.
That is different from buying half of a heart.
【简答题】为什么RNA在稀碱条件下可水解成单核苷酸，产物为2'-核苷酸和3'-核苷酸的混合物，而DNA在碱性条件下会有何变化
【简答题】（热值指在一定条件下每克物质完全燃烧所放出的热量，燃烧产物在该条件下是一种较为稳定的状态），下表是几种物质在常温常压下的热值数据． 物质 H 2 CO CH 4 热值/kJ?g -1 143 10 56 （1）根据以上热值数据，最理想的燃料是______． （2）根据以上热值数据，写出在该状态下表达氢气燃烧热的热化学方程式______． （3）若管道煤气（含体积比为1：1的H 2 和CO）价格为1...
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