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【单选题】

Meili Snow Mountain is located in ______ .

A.
Bai Autonomous Prefecture
B.
Tibetan Autonomous Prefecture
C.
Naxi Autonomous County
D.
Lisu Autonomous Prefecture
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参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】下列有关多部位一站式CTA检查要点与质量控制的叙述,错误的是()

A.
胸痛三联症扫描,在检查前应训练患者呼吸
B.
各部位检查均应双手上举
C.
碘对比剂一般高浓度、高注射速率
D.
可在满足诊断的需求下合理调整注射速度和总量
E.
图像后处理时应根据病变做会对性处理

【单选题】Corresponding to the excitation reactance of the asynchronous motor, there is ( ).

A.
Leakage reactor
B.
Armature reaction reactor
C.
Synchronous reactance
D.
There is no corresponding reactance to it.

【单选题】下列有关胸痛三联征一站式CTA检查技术的叙述,错误的是()

A.
双源CT心胸联合造影可诊断肺动脉、主动脉及冠状动脉疾病
B.
双源CT改善了获取优质的冠脉图像受限于患者心率的状况
C.
每次扫描一般在吸气末期屏气,要求呼吸幅度尽量一致
D.
患者心功能差者,可降低对比剂的注射速率
E.
对比剂多为370mgI/ml,可将对比剂与生理盐水按7:3比例混合

【单选题】Synchronous reactance represents the three-phase symmetrical and stable operation of synchronous motor ().

A.
A comprehensive parameter of the magnetic field of armature reaction
B.
A comprehensive parameter of air gap synthesis magnetic field
C.
A comprehensive parameter of armature reaction magnetic field and armature leakage magnetic field
D.
A comprehensive parameter of excitation field and excitation leakage field.

【单选题】In the sensitivity analysis of linear programming, it is ( ) that will change the value of the optimal objective function.

A.
The change of objective coefficient Cj
B.
The change of constraint constant bi
C.
Add a new variable
D.
Add a new constraint

【单选题】A three-phase synchronous generator runs stably under a symmetrical load( ) At this time, the armature reaction property is ( ).

A.
Straight-axis magnetic armature reflection;
B.
There are both straight-axis demagnetic armature reaction and cross-axis armature reaction;
C.
There are both straight-axis magnetic armature reactions and cross-axis armature reactions;
D.
There are both straight-axis armature reactions (demagnetization, magnetism-assistant) and cross-axis armature reactions.