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【单选题】
决议行为的特殊之处在于:
A.
每个人的意思表示,并不当然地产生一个不确定的权利义务产生、变更或消灭的后果
B.
每个人的意思表示,必然地产生一个确定的权利义务产生、变更或消灭的后果
C.
每个人的意思表示,并不当然地产生一个确定的权利义务产生、变更或消灭的后果
D.
每个人的意思表示,必然地产生一个不确定的权利义务产生、变更或消灭的后果
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举一反三
【多选题】PLC的工作过程主要包括
A.
上电启动
B.
输入刷新
C.
执行用户程序
D.
输出刷新
【单选题】下列相关实验不能达到预期目的是(  ) 相关实验 预期目的 ① 将SO 2 通入溴水,溴水褪色后加热观察能否恢复原色 验证SO 2 漂白的可逆性 ② 将氯水加入淀粉KI溶液中 验证Cl的非金属性比I强 ③ 在相同温度下,将表面积相同的铝条和镁条投入等体积同浓度的盐酸中,观察产生气泡的速率. 比较同周期金属元素的金属性强弱. ④ 利用电解质溶液的导电性装置,检测AlCl 3 溶液的导电性 证明AlC...
A.
仅①
B.
①④
C.
②③
D.
③④
【简答题】PLC的主要工作过程的中心内容包括:
【多选题】How do retroviruses proliferate in host cells?
A.
Like retrotransposons, retroviruses use the enzyme reverse transcriptase to convert RNA into DN The enzyme is encoded by the retroviral genome, and a few molecules of the enzyme are packaged along with the RNA genome in each virus particle. When the single-stranded RNA genome of the retrovirus enters a cell, the reverse transcriptase brought in with it makes a complementary DNA strand to form a DNA/RNA hybrid double helix.
B.
The RNA strand is removed, and the reverse transcriptase (which can use either DNA or RNA as a template) now synthesizes a complementary DNA strand to produce a DNA double helix. This DNA is then inserted, or integrated, into a randomly selected site in the host genome by a virally encoded integrase enzyme. In this integrated state, the virus is latent: each time the host cell divides, it passes on a copy of the integrated viral genome, which is known as a provirus, to its progeny cells.
C.
The next step in the replication of a retrovirus—which can take place long after its integration into the host genome—is the copying of the integrated viral DNA into RNA by a host-cell RNA polymerase, which produces large numbers of single-stranded RNAs identical to the original infecting genome.
D.
These viral RNAs are then translated by the host-cell ribosomes to produce the viral shell proteins, the envelope proteins, and reverse transcriptase—all of which are assembled with the RNA genome into new virus particles.
【多选题】PLC的工作过程实质上是一个不断循环的顺序扫描过程,其工作的主要过程包括( )
A.
输入采样
B.
执行程序
C.
刷新输出
D.
数据局转换
【多选题】PLC主要的工作过程包括( )
A.
自诊断
B.
输入扫描
C.
程序执行
D.
输出刷新
【简答题】American researchers have developed a technique that may become an important tool in fighting virus from attacking its target-cells in the body's defense system.When virus enters the blood,i...
【简答题】(12分)通过火法冶金炼出的铜是粗铜,含杂质金、银、铁、锌,不适于电器及其他许多工业使用,必须进行电解精炼。 ⑴在精炼铜时,阳极减小的质量与阴极增加的质量是否相等 ▲ (填“是”或“否”);阳极下面沉积金属的成分主要是 ▲ 。 ⑵在精炼铜的过程中,Cu 2+ 浓度逐渐下降,c(Fe 2+ )、c(Zn 2+ )会逐渐 ▲ ,所以需要定时除去其中的Fe 2+ 、Zn 2+ 。甲同学设计了下列除杂方案...
【单选题】PLC 的工作过程按先后顺序主要包括:( )
A.
自诊断、输入采样、程序扫描和输出刷新
B.
自诊断、程序执行、输出刷新、输入刷新
C.
自诊断、输出刷新、程序扫描和输入刷新
D.
输入采样、程序扫描、自诊断和输出刷新
【多选题】PLC 主要的工作过程包括( )
A.
自诊断
B.
输入扫描
C.
程序执行
D.
输出刷新
E.
内外通信
相关题目:
【多选题】How do retroviruses proliferate in host cells?
A.
Like retrotransposons, retroviruses use the enzyme reverse transcriptase to convert RNA into DN The enzyme is encoded by the retroviral genome, and a few molecules of the enzyme are packaged along with the RNA genome in each virus particle. When the single-stranded RNA genome of the retrovirus enters a cell, the reverse transcriptase brought in with it makes a complementary DNA strand to form a DNA/RNA hybrid double helix.
B.
The RNA strand is removed, and the reverse transcriptase (which can use either DNA or RNA as a template) now synthesizes a complementary DNA strand to produce a DNA double helix. This DNA is then inserted, or integrated, into a randomly selected site in the host genome by a virally encoded integrase enzyme. In this integrated state, the virus is latent: each time the host cell divides, it passes on a copy of the integrated viral genome, which is known as a provirus, to its progeny cells.
C.
The next step in the replication of a retrovirus—which can take place long after its integration into the host genome—is the copying of the integrated viral DNA into RNA by a host-cell RNA polymerase, which produces large numbers of single-stranded RNAs identical to the original infecting genome.
D.
These viral RNAs are then translated by the host-cell ribosomes to produce the viral shell proteins, the envelope proteins, and reverse transcriptase—all of which are assembled with the RNA genome into new virus particles.