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【单选题】
既能息风止痉又能攻毒散结的药物是A.
全蝎
B.
羚羊角
C.
牛黄
D.
地龙
E.
天南星
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【单选题】CRISPR/Cas is a powerful approach to edit genes. “CRISPR” stands for clustered, regularly interspaced short palindromic repeats; as the name suggests, these consist of a series of regularly spaced sho...
A.
The CRISPR sequences and Cas protein are components of a kind of nervous system that evolved to allow bacteria to survive infection by bacteriophages.
B.
CRISPR sequences are embedded in the bacterial genome, surrounding sequences derived from phage pathogens that previously infected the bacterium without killing it. The viral sequences are, in effect, spacer sequences separating the CRISPR sequences. When the same bacteriophage again attacks a bacterium with the corresponding CRISPR/Cas system, the CRISPR sequence and Cas protein act together to destroy the viral DN
C.
First, the CRISPR sequences are transcribed to RNA, and individual viral spacer sequences are cleaved to form products called guide RNAs (gRNAs), which include some adjacent repeat RN A gRNA forms a complex with one or more Cas proteins and, in some cases, with another RNA called a trans-activating CRISPR RNA, or tracrRN
D.
The resulting complex binds specifically to the invading bacteriophage DNA, cleaving and destroying it through the nuclease activities associated with the Cas proteins.
【简答题】在管壳式换热器中饱和蒸汽加热空气,则 (1)传热管的壁温接近 温度;(饱和蒸汽、空气) (2)换热器总传热系数K将接近 对流传热系数。(饱和蒸汽、空气)
【多选题】下列选项中,符合使用提取的专用基金购置固定资产、无形资产的账务处理的是( )。
A.
按照预算会计下基于预算收入计算提取的金额,借记“本年盈余”等科目,贷记“专用基金”科目
B.
按照专用基金使用金额,借记“专用基金”科目,贷记“累计盈余”科目
C.
按照固定资产、无形资产成本金额,借记“固定资产”“无形资产”科目,贷记“银行存款”等科目
D.
按照预算会计下计算的提取金额,借记“本年盈余分配”科目,贷记“专用基金”科目
【简答题】引起气性坏疽的微生物是
【简答题】引起气性坏疽的微生物是
【简答题】在管壳式换热器中饱和蒸汽加热空气,则 传热管的管壁温度接近( )温度 传热总传热系数K将接近( )对流传热系数
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