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【单选题】
读零件图,回答问题。 1. 在尺寸φ15H8中:φ15表示( ),H表示( ),8表示( )? A. 公称直径;的公差带代号;公差值 B. 直径尺寸;轴的公差带代号;公差等级 C. 公称尺寸;基本偏差代号;公差等级 2. 该零件表面粗糙度要求最高的表面是( ),其Ra值是( )? D. φ27f7圆柱面 ;Ra6.3 E.零件左端面;Ra1.6 3.图中未注倒角是( )? F. C2 G.C1
A.
B.
C.
D.
E.
F.
F
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参考答案：
举一反三
【单选题】SPOOL 技术的主要目的是 ( ) 。
A.
提高 cpu 和设备交换信息的速度。
B.
提高独占设备的利用率
C.
减轻用户的编程负担
D.
提供主、辅存接口
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【单选题】Pathway regulation can occur via the expression of tissue-specific isozymes. Glucose metabolism differs in red blood cells and liver in that red blood cells need to metabolize glucose, whereas the liv...
A.
The Km of hexokinase I is higher than the Km of glucokinase.
B.
The Km of hexokinase I is lower than the Km of glucokinase.
C.
The Km of hexokinase I is the same as the Km of glucokinase
D.
Hexokinase I is found in liver.
E.
Glucokinase is found in red blood cells.
查看完整题目与答案
【单选题】尿中出现蜡样管型表示( )
A.
急性肾小管损害
B.
慢性肾炎早期
C.
慢性肾炎晚期
D.
急性肾炎
E.
急性肾盂肾炎
查看完整题目与答案
【简答题】The ultraviolet radiation in sunlight is also damaging to DNA; it promotes covalent linkage between two adjacent pyrimidine bases, forming, for example, the _____________.
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【单选题】When blood glucose levels decrease, hormone "A" is secreted. Based on this information, hormone A is controlled by
A.
changes in the level of a chemical in the blood.
B.
direct stimulation by the nervous system.
C.
stimulation by a hormone released from another endocrine gland.
D.
a hypothalamic releasing factor.
查看完整题目与答案
【单选题】尿中出现蜡样管型表示
A.
肾脏有轻度功能改变
B.
肾脏有暂时性功能改变
C.
肾小球有急性功能改变
D.
肾盂有急性炎症改变
E.
肾脏有长期严重的病变
查看完整题目与答案
【单选题】尿中出现蜡样管型表示
A.
肾有暂时性功能改变
B.
肾有轻度功能改变
C.
肾有急性功能改变
D.
肾盂有急性炎症改变
E.
肾有长期严重的病变
查看完整题目与答案
【简答题】Glucagonraises blood glucose levels by stimulating the to metabolize glycogen into glucose molecules and to release glucose into the blood.
查看完整题目与答案
【单选题】若α=2，则 [     ]
A.
sinα＞0，cosα＞0
B.
sinα＞0，cosα＜0
C.
sinα＜0，cosα＜0
D.
sinα＜0，cosα＞0
查看完整题目与答案
【多选题】How does blood glucose regulate insulin secretion by pancreatic β cells?
A.
When blood glucose rises, GLUT2 transporters carry glucose into the β cells, where it is immediately converted to glucose 6-phosphate by glucokinase and enters glycolysis.
B.
With the higher rate of glucose catabolism, 2 [ATP] increases, causing the closing of ATP-gated K + channels in the plasma membrane. Reduced efflux of K + depolarizes the membrane. Membrane depolarization opens voltage-gated Ca 2+ channels, and the resulting increase in cytosolic [Ca 2+ ] triggers the release of insulin by exocytosis.
C.
The brain integrates inputs on energy supply and demand, and signals from the parasympathetic and sympathetic nervous systems also affect (stimulate and inhibit, respectively) insulin release.
D.
A simple feedback loop limits hormone release: insulin lowers blood glucose by stimulating glucose uptake by the tissues; the reduced blood glucose is detected by the β cell as a diminished flux through the glucokinase reaction; this slows or stops the release of insulin. This feedback regulation holds blood glucose concentration nearly constant despite large fluctuations in dietary intake.
查看完整题目与答案
相关题目：
【单选题】SPOOL 技术的主要目的是 ( ) 。
A.
提高 cpu 和设备交换信息的速度。
B.
提高独占设备的利用率
C.
减轻用户的编程负担
D.
提供主、辅存接口
查看完整题目与答案
【单选题】Pathway regulation can occur via the expression of tissue-specific isozymes. Glucose metabolism differs in red blood cells and liver in that red blood cells need to metabolize glucose, whereas the liv...
A.
The Km of hexokinase I is higher than the Km of glucokinase.
B.
The Km of hexokinase I is lower than the Km of glucokinase.
C.
The Km of hexokinase I is the same as the Km of glucokinase
D.
Hexokinase I is found in liver.
E.
Glucokinase is found in red blood cells.
查看完整题目与答案
【单选题】尿中出现蜡样管型表示( )
A.
急性肾小管损害
B.
慢性肾炎早期
C.
慢性肾炎晚期
D.
急性肾炎
E.
急性肾盂肾炎
查看完整题目与答案
【简答题】The ultraviolet radiation in sunlight is also damaging to DNA; it promotes covalent linkage between two adjacent pyrimidine bases, forming, for example, the _____________.
查看完整题目与答案
【单选题】When blood glucose levels decrease, hormone "A" is secreted. Based on this information, hormone A is controlled by
A.
changes in the level of a chemical in the blood.
B.
direct stimulation by the nervous system.
C.
stimulation by a hormone released from another endocrine gland.
D.
a hypothalamic releasing factor.
查看完整题目与答案
【单选题】尿中出现蜡样管型表示
A.
肾脏有轻度功能改变
B.
肾脏有暂时性功能改变
C.
肾小球有急性功能改变
D.
肾盂有急性炎症改变
E.
肾脏有长期严重的病变
查看完整题目与答案
【单选题】尿中出现蜡样管型表示
A.
肾有暂时性功能改变
B.
肾有轻度功能改变
C.
肾有急性功能改变
D.
肾盂有急性炎症改变
E.
肾有长期严重的病变
查看完整题目与答案
【简答题】Glucagonraises blood glucose levels by stimulating the to metabolize glycogen into glucose molecules and to release glucose into the blood.
查看完整题目与答案
【单选题】若α=2，则 [     ]
A.
sinα＞0，cosα＞0
B.
sinα＞0，cosα＜0
C.
sinα＜0，cosα＜0
D.
sinα＜0，cosα＞0
查看完整题目与答案
【多选题】How does blood glucose regulate insulin secretion by pancreatic β cells?
A.
When blood glucose rises, GLUT2 transporters carry glucose into the β cells, where it is immediately converted to glucose 6-phosphate by glucokinase and enters glycolysis.
B.
With the higher rate of glucose catabolism, 2 [ATP] increases, causing the closing of ATP-gated K + channels in the plasma membrane. Reduced efflux of K + depolarizes the membrane. Membrane depolarization opens voltage-gated Ca 2+ channels, and the resulting increase in cytosolic [Ca 2+ ] triggers the release of insulin by exocytosis.
C.
The brain integrates inputs on energy supply and demand, and signals from the parasympathetic and sympathetic nervous systems also affect (stimulate and inhibit, respectively) insulin release.
D.
A simple feedback loop limits hormone release: insulin lowers blood glucose by stimulating glucose uptake by the tissues; the reduced blood glucose is detected by the β cell as a diminished flux through the glucokinase reaction; this slows or stops the release of insulin. This feedback regulation holds blood glucose concentration nearly constant despite large fluctuations in dietary intake.
查看完整题目与答案
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