皮皮学，免费搜题
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【单选题】
人口红利是指一个国家的劳动年龄人口占总人口比重较大，抚养率比较低，为经济发展创造了有利的人口条件，整个国家的经济储蓄、高投资和高增长的局面．下列关于人口红利的说法，不正确的是( )．
A.
中国目前的人口年龄结构处于人口红利阶段
B.
人口红利对经济增长的影响主要体现在对生产领域的影响和对消费、储蓄的影响
C.
人口红利期应当充分利用劳动力资源，积累社会财富
D.
与人口红利相对应的人口负债主要是指就业压力大，就业形势严峻的局面
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举一反三
【单选题】线性规划具有无界解是指
A.
存在某个检验数＞0,且此检验数所在的列上的系数均不＞0
B.
可行解集合无界
C.
有相同的最小比值
D.
最优表中所有非基变量的检验数非零
查看完整题目与答案
【单选题】线性规划具有无界解是指( )
A.
可行解集合无界
B.
有相同的最小比值
C.
存在某个检验数λ k >0且
D.
最优表中所有非基变量的检验数非零
E.
:C
F.
程度:中
G.
解析:
H.
:单选题2.线性规划具有多重最优解是指( )
I.
函数系数与某约束系数对应成比例
J.
表中存在非基变量的检验数为零 K. 解集合无界 L. 存在基变量等于零
查看完整题目与答案
【单选题】You stain membrane proteins with a fluorescent-labeled antibody and notice the membrane is evenly stained. After a few hours, all of the fluorescence is at one end of a cell. You can conclude that ( )...
A.
Lipids flip-flop in the membrane
B.
Proteins move laterally in the membrane
C.
The fluorescent dye was bleached
D.
Proteins act as transporters
查看完整题目与答案
【单选题】Molecules that are soluble in ___________ can pass through the fatty acid portion of the cell membrane unassisted.
A.
water
B.
cholesterol
C.
gases
D.
lipids
查看完整题目与答案
【单选题】符合光吸收定律的透明溶液稀释后,其最大吸收峰波长的位置
A.
不移动
B.
向短波方向移动
C.
向长波方向移动
D.
吸收峰变宽
查看完整题目与答案
【多选题】Following vesicle docking, how do SNARE proteins catalyze the fusion of the vesicle and target membranes?
A.
Once appropriately triggered, the tight pairing of v-SNAREs and t-SNAREs draws the two lipid bilayers into close apposition.
B.
The force of the SNAREs winding together squeezes out any water molecules that remain trapped between the two membranes, allowing their lipids to flow together to form a continuous bilayer.
C.
In a cell, other proteins recruited to the fusion site help to complete the fusion process.
D.
After fusion, the SNAREs are pried apart so that they can be used again.
查看完整题目与答案
【判断题】图示对称桁架各杆 EA 相同,结点 A 和结点 B 的竖向位移均为零。
A.
正确
B.
错误
查看完整题目与答案
【单选题】The fluid mosaic model of the membrane describes the membrane as
A.
containing a significant quantity of water in the interior.
B.
composed of fluid phospholipids on the outside and protein on the inside.
C.
composed of protein on the outside and fluid phospholipids on the inside.
D.
made of proteins and lipids that can freely move.
查看完整题目与答案
【多选题】下面那些是“Rending Engine”(渲染引擎)?( )
A.
Trident
B.
Gecko
C.
Webkit
D.
Presto
查看完整题目与答案
【单选题】患者女,28岁。停经40天,下腹隐痛2天、加重l天人院。查体:面色苍白,四肢湿冷,体温不升。脉搏126次/分,血压70/50mmHg,此时最适宜的体位是
A.
侧卧位
B.
俯卧位
C.
中凹卧位
D.
半坐卧位
E.
去枕仰卧位
查看完整题目与答案
相关题目：
【单选题】线性规划具有无界解是指
A.
存在某个检验数＞0,且此检验数所在的列上的系数均不＞0
B.
可行解集合无界
C.
有相同的最小比值
D.
最优表中所有非基变量的检验数非零
查看完整题目与答案
【单选题】线性规划具有无界解是指( )
A.
可行解集合无界
B.
有相同的最小比值
C.
存在某个检验数λ k >0且
D.
最优表中所有非基变量的检验数非零
E.
:C
F.
程度:中
G.
解析:
H.
:单选题2.线性规划具有多重最优解是指( )
I.
函数系数与某约束系数对应成比例
J.
表中存在非基变量的检验数为零 K. 解集合无界 L. 存在基变量等于零
查看完整题目与答案
【单选题】You stain membrane proteins with a fluorescent-labeled antibody and notice the membrane is evenly stained. After a few hours, all of the fluorescence is at one end of a cell. You can conclude that ( )...
A.
Lipids flip-flop in the membrane
B.
Proteins move laterally in the membrane
C.
The fluorescent dye was bleached
D.
Proteins act as transporters
查看完整题目与答案
【单选题】Molecules that are soluble in ___________ can pass through the fatty acid portion of the cell membrane unassisted.
A.
water
B.
cholesterol
C.
gases
D.
lipids
查看完整题目与答案
【单选题】符合光吸收定律的透明溶液稀释后,其最大吸收峰波长的位置
A.
不移动
B.
向短波方向移动
C.
向长波方向移动
D.
吸收峰变宽
查看完整题目与答案
【多选题】Following vesicle docking, how do SNARE proteins catalyze the fusion of the vesicle and target membranes?
A.
Once appropriately triggered, the tight pairing of v-SNAREs and t-SNAREs draws the two lipid bilayers into close apposition.
B.
The force of the SNAREs winding together squeezes out any water molecules that remain trapped between the two membranes, allowing their lipids to flow together to form a continuous bilayer.
C.
In a cell, other proteins recruited to the fusion site help to complete the fusion process.
D.
After fusion, the SNAREs are pried apart so that they can be used again.
查看完整题目与答案
【判断题】图示对称桁架各杆 EA 相同,结点 A 和结点 B 的竖向位移均为零。
A.
正确
B.
错误
查看完整题目与答案
【单选题】The fluid mosaic model of the membrane describes the membrane as
A.
containing a significant quantity of water in the interior.
B.
composed of fluid phospholipids on the outside and protein on the inside.
C.
composed of protein on the outside and fluid phospholipids on the inside.
D.
made of proteins and lipids that can freely move.
查看完整题目与答案
【多选题】下面那些是“Rending Engine”(渲染引擎)?( )
A.
Trident
B.
Gecko
C.
Webkit
D.
Presto
查看完整题目与答案
【单选题】患者女,28岁。停经40天,下腹隐痛2天、加重l天人院。查体:面色苍白,四肢湿冷,体温不升。脉搏126次/分,血压70/50mmHg,此时最适宜的体位是
A.
侧卧位
B.
俯卧位
C.
中凹卧位
D.
半坐卧位
E.
去枕仰卧位
查看完整题目与答案