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【单选题】
有一混合蛋白质溶液，各种蛋白质的等电点分别为4.6、5.0、5.3、6.7、7.3。电泳时，欲使其中的4种蛋白质泳向正极，缓冲液的pH值(    )。
A.
4.0    
B.
5.0    
C.
6.0    
D.
7.0
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参考答案：
举一反三
【判断题】When Mac entered the hospital, he was apparently a normal person except for an enduring cough.
A.
正确
B.
错误
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【单选题】When Mac entered the hospital, he was apparently a normal person except for an enduring cough.
A.
True
B.
False
查看完整题目与答案
【单选题】当温度升高时,本征半导体中的自由电子和空穴的数量( )。
A.
增加
B.
减少
C.
不变
查看完整题目与答案
【判断题】When Mac entered the hospital, he was apparently a nomal person except for an enduring cough.
A.
正确
B.
错误
查看完整题目与答案
【单选题】用喷注润滑方式进行润滑时,油箱中的油温变动控制在 °C。
A.
±10
B.
±0.5
C.
±1
D.
±5
查看完整题目与答案
【多选题】As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the devicE.For what two reasons can this happen? （）
A.
The data is moving from 10BASE-TX to 100BASE-TX.
B.
The WAN encapsulation type has changed.
C.
The data format has changed from analog to digital.
D.
The source and destination hosts are in the same subnet.
E.
The source and destination MAC addresses have changed.
查看完整题目与答案
【多选题】奶牛饲养管理按其生理状况的不同阶段,可分为( )。
A.
配种期
B.
妊娠期
C.
泌乳期
D.
干乳期
E.
围产期
查看完整题目与答案
【判断题】利多卡因是一速效、高效的抗心律失常药,对室上性、室性心律失常均有良效。
A.
正确
B.
错误
查看完整题目与答案
【多选题】As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the device. For what two reasons can this happen?
A.
The data is moving from 10BASE-TX to 100BASE-TX.
B.
The WAN encapsulation type has changed.
C.
The data format has changed from analog to digital.
D.
The source and destination hosts are in the same subnet.
E.
The source and destination MAC addresses have changed.
查看完整题目与答案
【单选题】质量控制是为了达到质量要求所采取的作业技术和( )。
A.
过程
B.
技术
C.
程序
D.
活动
查看完整题目与答案
相关题目：
【判断题】When Mac entered the hospital, he was apparently a normal person except for an enduring cough.
A.
正确
B.
错误
查看完整题目与答案
【单选题】When Mac entered the hospital, he was apparently a normal person except for an enduring cough.
A.
True
B.
False
查看完整题目与答案
【单选题】当温度升高时,本征半导体中的自由电子和空穴的数量( )。
A.
增加
B.
减少
C.
不变
查看完整题目与答案
【判断题】When Mac entered the hospital, he was apparently a nomal person except for an enduring cough.
A.
正确
B.
错误
查看完整题目与答案
【单选题】用喷注润滑方式进行润滑时,油箱中的油温变动控制在 °C。
A.
±10
B.
±0.5
C.
±1
D.
±5
查看完整题目与答案
【多选题】As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the devicE.For what two reasons can this happen? （）
A.
The data is moving from 10BASE-TX to 100BASE-TX.
B.
The WAN encapsulation type has changed.
C.
The data format has changed from analog to digital.
D.
The source and destination hosts are in the same subnet.
E.
The source and destination MAC addresses have changed.
查看完整题目与答案
【多选题】奶牛饲养管理按其生理状况的不同阶段,可分为( )。
A.
配种期
B.
妊娠期
C.
泌乳期
D.
干乳期
E.
围产期
查看完整题目与答案
【判断题】利多卡因是一速效、高效的抗心律失常药,对室上性、室性心律失常均有良效。
A.
正确
B.
错误
查看完整题目与答案
【多选题】As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the device. For what two reasons can this happen?
A.
The data is moving from 10BASE-TX to 100BASE-TX.
B.
The WAN encapsulation type has changed.
C.
The data format has changed from analog to digital.
D.
The source and destination hosts are in the same subnet.
E.
The source and destination MAC addresses have changed.
查看完整题目与答案
【单选题】质量控制是为了达到质量要求所采取的作业技术和( )。
A.
过程
B.
技术
C.
程序
D.
活动
查看完整题目与答案
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