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【单选题】
A synchronous generator connected in parallel to an infinite power grid, if the excitation current remains unchanged, reduce the output active power(
) under the condition of, at this time ().
A.
The power Angle decreases and the power factor decreases
B.
The power factor decreases when the power Angle increases
C.
The power Angle decreases and the power factor increases
D.
As the power Angle increases, the power factor increases
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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】关于肝脏相关疾病的CT检查要点的描述错误的是()
A.
在诊断肝脏病变的图像窗宽需要比胰腺、肾脏等脏器略窄,约200Hu
B.
对于肝脏内占位性病变,应行CT增强扫描进行病变性质的鉴别诊断
C.
增强时相需要准确,不需要延长延迟时间
D.
肝癌伴病灶坏死时,需分别测量肿瘤坏死区、肿瘤边缘以及正常肝实质的CT值
E.
肝脏占位性病变,需要测量其最大平面的肿物直径
【单选题】What can provide food and carry goods in Tibetan's life?
A.
Tibetan mastiffs
B.
yaks
C.
horses
D.
sheep
【单选题】Matsuake is a kind of alpine mushroom that is rich in ______ .
A.
alkali
B.
protein
C.
amino acids
D.
oil
【单选题】There are （ ） repetitions of the action in the three-nodding phoenix method.
A.
1
B.
2
C.
3
D.
4
【单选题】For the transportation problem with minimum total transportation cost, if the optimal solution has been obtained, then the test number of all spaces is ( )
A.
More than 0
B.
Less than 0
C.
Non negative
D.
Non positive