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【多选题】
已知某反应系统为 ,其微分方程可以描述为 ,初始条件为时间t为0时,C1的浓度为1,C2,C3为0。 已知k1,k2,k3分别为0.04,1,3。求时间为500时,C1,C2,C3的浓度分别为多少?A.
0.177173
B.
0.008457
C.
0.814371
D.
0.127171
E.
0.080194
F.
0.810128
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【单选题】根据资料(1)至(5)，下列各项中，当月编制的利润表“营业收入，，项 目应填列金额是( )元。
A.
730 000
B.
740 000
C.
560 000
D.
680 000
【多选题】市场营销学的营销观念经历了6个发展阶段，其中产生于卖方市场条件下的营销观念有()。
A.
生产观念
B.
产品观念
C.
推销观念
D.
市场营销观念
E.
社会市场营销观念
【单选题】1) In which compartment of the cell does glycolysis occur?
A.
Mitochondrion
B.
Nucleus
C.
Soluble cytoplasm (cytosol)
D.
Rough endoplasmic reticulum
【单选题】下列会计差错中,影响营业利润这一项目金额的是()。
A.
将公允价值变动损益错登为“投资收益
B.
将营业外支出错登为“其他业务成本”
C.
将定额内损耗的存货盘亏错登为“销售费用”
D.
将出售原材料的成本错登为“主营业务成本”
【单选题】下列会计差错中 , 影响“营业利润 " 这一项目金额的是 ( ) 。
A.
将公允价值变动损益错登为 “投资收益”
B.
将营业外支出错登为 “其他业务成本”
C.
将定额内损耗的存贷盘亏错登为 " 销售费用 ”
D.
将出售原材料的成本错登为 “主营业务成本 "
【单选题】In an argumentative essay, you have to make some claims, especially those of fact, cause or effect, value, and policy. Which type does the following statement belong to?Does the use of cell phones in ...
A.
fact
B.
cause or effect
C.
value
D.
policy
【多选题】How does the cell determine which parts of the RNA transcript to remove during RNA splicing?
A.
Unlike the coding sequence of an exon, most of the nucleotide sequence of an intron is unimportant. Although there is little overall resemblance between the nucleotide sequences of different introns, each intron contains a few short nucleotide sequences that act as cues for its removal from the pre-mRN
B.
These special sequences are found at or near each end of the intron and are the same or very similar in all introns. The special sequences are recognized primarily by small nuclear ribonucleoproteins (snRNPs), which direct the cleavage of the RNA at the intron–exon borders and catalyze the covalent linkage of the exon sequences.
C.
Guided by these sequences, an elaborate splicing machine cuts out the intron in the form of a “lariat” structure, formed by the reaction of an adenine nucleotide. The removed intron is eventually degraded in the nucleus.
D.
Unlike the other steps of mRNA production, RNA splicing is carried out largely by RNA molecules rather than proteins. These RNA molecules, called small nuclear RNAs (snRNAs), are packaged with additional proteins to form snRNPs. RNA molecules that catalyze reactions in this way are known as ribozymes. Together, these snRNPs form the core of the spliceosome, the large assembly of RNA and protein molecules that carries out RNA splicing in the nucleus.
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