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【单选题】
患有职业禁忌症和年老体弱、视力不佳及()后人员等,不得进行高处作业。
A.
酒
B.
饭
C.
病愈
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【单选题】三相异步电动机的正反转控制,关键是改变( )
A.
电源电压
B.
电源相序
C.
电源电流
D.
负载大小
查看完整题目与答案
【简答题】三相异步电动机正反转控制的关键是改变 。
查看完整题目与答案
【单选题】慢性肾衰竭患者，近日恶心、呕吐，进食少，并有尿少、脉缓，血清钾10.2mmol/L。估计患者病情恶化，最可能出现的情况是
A.
休克
B.
心力衰竭
C.
心脏骤停
D.
昏迷
E.
抽搐
查看完整题目与答案
【单选题】Which of the following cells are steroid hormone secreting cells?
A.
Parafollicular cells
B.
Chromaffin cells
C.
Cells of zona glomerulosa
D.
Somatotropes
E.
Thyrotropes
查看完整题目与答案
【单选题】关于学龄儿童神经精神发育,不正确的叙述()
A.
脑重接近成人水平
B.
6岁儿童的手、足优势在很大程度上开始定型
C.
神经纤维6岁半时几乎都髓鞘化
D.
学龄期儿童大脑的抑制强于兴奋
E.
理解力、注意力和记忆力变得更有意识
查看完整题目与答案
【单选题】三相异步电动机正反转控制的关键是改变( )。
A.
电源电压
B.
电源相序
C.
电源电流
D.
负载大小
查看完整题目与答案
【单选题】According to the passage, stem cells refer to ______.
A.
cells that can become brain cells, blood cells or many other kinds of cell.
B.
cells that can become what they want to be pretty much any other type of cell.
C.
cells that are uncertain to become blood cells or brain cells when they grow up.
D.
cells that have not decided when they grow up.
查看完整题目与答案
【单选题】Which of the following cells have no gap junctions between cells?
A.
Cardiac muscle cells
B.
Smooth muscle cells
C.
Osteocytes
D.
Skeletal muscle cells
E.
Epithelial cells
查看完整题目与答案
【多选题】Cancer cells are totally different from normal cells in that:
A.
1. Cancer cells have a reduced dependence on signals from other cells for their survival, growth, and division. 2. Cancer cells can survive levels of stress and internal derangement that would cause normal cells to kill themselves by apoptosis.
B.
3. Unlike most normal human cells, cancer cells can often proliferate indefinitely. 4. Most cancer cells are genetically unstable, with a greatly increased mutation rate and an abnormal number of chromosomes.
C.
5. Cancer cells are abnormally invasive, at least partly because they often lack certain cell adhesion molecules, such as cadherins, that help hold normal cells in their proper place. 6. Cancer cells are abnormally avid for nutrients, which they use to generate much of their ATP by glycolysis in the cell cytosol.
D.
7. Cancer cells can survive and proliferate in abnormal locations, whereas most normal cells die when misplaced. 8. As cancer cells evolve, they secrete signals that influence the behavior of cells in the surrounding connective tissue, thereby modifying the tumor’s microenvironment.
查看完整题目与答案
【单选题】The interactions between T cells and B cells include that
A.
B cells present antigens for Th cells as APCs
B.
Activated Th cells provide the second signal for B cells
C.
Cytokines secreted by activated Th cells induce B cell activation and proliferation
D.
B cells provide double signals for T cell activation
E.
All of the above
查看完整题目与答案
相关题目：
【单选题】三相异步电动机的正反转控制,关键是改变( )
A.
电源电压
B.
电源相序
C.
电源电流
D.
负载大小
查看完整题目与答案
【简答题】三相异步电动机正反转控制的关键是改变 。
查看完整题目与答案
【单选题】慢性肾衰竭患者，近日恶心、呕吐，进食少，并有尿少、脉缓，血清钾10.2mmol/L。估计患者病情恶化，最可能出现的情况是
A.
休克
B.
心力衰竭
C.
心脏骤停
D.
昏迷
E.
抽搐
查看完整题目与答案
【单选题】Which of the following cells are steroid hormone secreting cells?
A.
Parafollicular cells
B.
Chromaffin cells
C.
Cells of zona glomerulosa
D.
Somatotropes
E.
Thyrotropes
查看完整题目与答案
【单选题】关于学龄儿童神经精神发育,不正确的叙述()
A.
脑重接近成人水平
B.
6岁儿童的手、足优势在很大程度上开始定型
C.
神经纤维6岁半时几乎都髓鞘化
D.
学龄期儿童大脑的抑制强于兴奋
E.
理解力、注意力和记忆力变得更有意识
查看完整题目与答案
【单选题】三相异步电动机正反转控制的关键是改变( )。
A.
电源电压
B.
电源相序
C.
电源电流
D.
负载大小
查看完整题目与答案
【单选题】According to the passage, stem cells refer to ______.
A.
cells that can become brain cells, blood cells or many other kinds of cell.
B.
cells that can become what they want to be pretty much any other type of cell.
C.
cells that are uncertain to become blood cells or brain cells when they grow up.
D.
cells that have not decided when they grow up.
查看完整题目与答案
【单选题】Which of the following cells have no gap junctions between cells?
A.
Cardiac muscle cells
B.
Smooth muscle cells
C.
Osteocytes
D.
Skeletal muscle cells
E.
Epithelial cells
查看完整题目与答案
【多选题】Cancer cells are totally different from normal cells in that:
A.
1. Cancer cells have a reduced dependence on signals from other cells for their survival, growth, and division. 2. Cancer cells can survive levels of stress and internal derangement that would cause normal cells to kill themselves by apoptosis.
B.
3. Unlike most normal human cells, cancer cells can often proliferate indefinitely. 4. Most cancer cells are genetically unstable, with a greatly increased mutation rate and an abnormal number of chromosomes.
C.
5. Cancer cells are abnormally invasive, at least partly because they often lack certain cell adhesion molecules, such as cadherins, that help hold normal cells in their proper place. 6. Cancer cells are abnormally avid for nutrients, which they use to generate much of their ATP by glycolysis in the cell cytosol.
D.
7. Cancer cells can survive and proliferate in abnormal locations, whereas most normal cells die when misplaced. 8. As cancer cells evolve, they secrete signals that influence the behavior of cells in the surrounding connective tissue, thereby modifying the tumor’s microenvironment.
查看完整题目与答案
【单选题】The interactions between T cells and B cells include that
A.
B cells present antigens for Th cells as APCs
B.
Activated Th cells provide the second signal for B cells
C.
Cytokines secreted by activated Th cells induce B cell activation and proliferation
D.
B cells provide double signals for T cell activation
E.
All of the above
查看完整题目与答案