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【单选题】
Synchronous generators parallel to the infinite grid must ( ) to increase
(
) to
(
) while keeping the load current as the rated value.
A.
Increase the excitation current and the input torque;
B.
Increase the excitation current and decrease the input torque;
C.
Reduce the excitation current and increase the input torque;
D.
Reduce the excitation current and increase the input torque.
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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】When searching for a closed circuit of a space, if you encounter a kigg, you can choose, but the following statement is incorrect ( )
A.
turn 90 degrees left
B.
turn right 90 degrees
C.
cross
D.
back
【单选题】When solving the transportation problem, the number of "vertices" on the closed loop of each space must be ( )
A.
Four
B.
Even
C.
Odd
D.
Uncertain
【单选题】Beat 3 of the Bumper Harvest Steps: Withdraw the left foot, land it 30cm right ahead the right foot, beat the front drum head with the right hand, open both arms.
A.
45
B.
40
C.
35
D.
30
【单选题】During normal operation, the generator outputs both active and reactive power, which is called power late phase (also known as lag). At this time, the generator sends () reactive power.
A.
Inductive
B.
Capacitive
C.
Inductive and capacitive
D.
None of them
【单选题】Most of the sand here is ______.
A.
quartz sand
B.
beach sand
C.
artificial sand
D.
dry sand
【单选题】How old is the Colorful Sand Forest?
A.
270 million years old
B.
340 million years old
C.
210 million yesrs old
D.
300 million years old
【单选题】下列有关盆腔CT检查质量控制标准的叙述,错误的是()
A.
清洁灌肠要求直结肠无大粪块,无气体积聚,肠道充分清洁
B.
保留灌肠要求直肠中度充盈,无粪块,对比剂充盈过乙状结肠远侧
C.
口服对比剂要求盆腔内小肠全面充盈对比剂
D.
膀胱充盈达标标准要求膀胱呈圆形,显示黏膜皱襞
E.
阴道塞位于阴道外口与宫颈开口之间
【单选题】In integer programming, the value of variable may be ( ).
A.
Integer
B.
0 or 1
C.
Integer which equal and greater than zero
D.
All three are possible