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【单选题】
After the parallel operation of two transformers with the same unit value of group and impedance voltage standard but different ratio ().
A.
Circulating current is generated only in the primary winding;
B.
Circulating current is generated only in the secondary winding
C.
Circulating current is generated in both primary and secondary windings
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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】有关胸廓入口CT检查相关准备的叙述,错误的是()
A.
去除颈部项链
B.
做好敏感腺体甲状腺的辐射防护
C.
检查期间不可做吞咽动作
D.
双肩尽量下垂紧贴检查床
E.
增强扫描患者扫描前需禁食4小时
【单选题】How did Naigu Stone Forest get the name?
A.
the shapes of the limestone
B.
the color of the limestone
C.
the location of the limestone
D.
the scale of the limestone
【单选题】What does "black" mean in the cultural of local minority?
A.
strength
B.
bravery
C.
dignity
D.
All above
【单选题】The best way to slow down the speed of erosion is to control ______.
A.
the quantity of water
B.
the frequency of rainfall
C.
the quality of soil
D.
the emission of carbon dioxide
【多选题】In the Stone Forest， the main shapes of limestone are the followings: ______, ______, ______and ______.
A.
mushroom-like limestone
B.
pagoda-like limestone
C.
column-shaped limestone
D.
sword-like limestone
【单选题】The mathematical model of LP consists of three parts ( )
A.
decision variables, objective functions , constraints
B.
decision variable, non-negative constraints , deviation variables
C.
objective variables, decision variables, deviation variables
D.
basic equations, resource constraints and goal constraints
【单选题】A three-phase AC motor, the stator windings of 2p = 4 and Z=36 are double laminated windings, = 2 and , so the pitch and slot pitch angles are respectively ().
A.
6,10°
B.
7,20°
C.
9,30°
【单选题】下列有关累及头颈和臂部动脉的无脉症CTA检查的叙述,错误的是()
A.
检查体位为双手伸直位于身体两侧
B.
扫描范围一般为主动脉弓至头顶
C.
触发扫描时触发层面位于气管分叉水平主动脉
D.
启动检测时间为注射对比剂10秒后
E.
当阈值达200HU时开始扫描