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【多选题】
合同成立的条件包括( )。A.
合同内容要合法
B.
经过主管部门批准
C.
当事人意见表示真实
D.
合同当事人具有合法资格
E.
采用书面形式
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【简答题】遗传物质改变引起的变异属于______的变异，仅由______引起的变异属于不可遗传的变异．
【多选题】What is an intron?
A.
Most protein-coding eukaryotic genes, in contrast, have their coding sequences interrupted by long, noncoding, intervening sequences called introns.
B.
The scattered pieces of coding sequence—called expressed sequences or exons—are usually shorter than the introns, and they often represent only a small fraction of the total length of the gene.
C.
Introns range in length from a single nucleotide to more than 10,000 nucleotides.
D.
Some protein-coding eukaryotic genes lack introns altogether, some have only a few, but most have many.
【简答题】某公司为降低库存成本,采用订货点法控制某种商品的库存。该商品的年需求量为1000吨,订购成本为每次10元,每年每吨商品的持有成本为0.5元。该公司每次订货最佳数量为 吨?
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