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【多选题】
下列关于梦魇症的说法，正确的是( )A.
梦的内容常涉及对生存、安全的恐惧事件
B.
该症的一个显著特征是患者醒后对梦境中的恐惧内容清晰回忆
C.
醒后患者不能很快恢复定向力，处于不清醒状态
D.
多发生在睡眠后期的REM(快速动眼)期
E.
本病一般于3～6岁年龄阶段，患病率随年龄增长逐渐减少
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【单选题】Suppose the rated capacity of the main engine of a ship is 10,000 kW at 100 rated rpm, then when at 80 rpm its capacity should be _____.
A.
800 kW
B.
5120 kW
C.
6400 kW
D.
4180 kW
【单选题】Rated current of AC contactor under different rated voltage
A.
same
B.
has nothing to do with the voltage
C.
is proportional to the voltage
D.
different
【单选题】Rated current of the contactor refers to ( )
A.
rated current of the coil
B.
rated current of the main contact
C.
rated current of the auxiliary contact
D.
None of the above three
【单选题】The rated power of this inductive motor is 3 Kw, this means ______.
A.
The rated power of this inductive motor is 3 Kw, this means ______.
B.
The rated power of this inductive motor is 3 Kw, this means ______.
C.
the maximum mechanical input power of the shaft is 3 Kw
D.
the maximum electric output power of the power source is 3 Kw
【单选题】The car is running at the ______ of 40 kilometers an hour.
A.
rates
B.
rating
C.
rate
D.
rated
【单选题】The generator normally operates at 5% above the network rated voltage, so the rated voltage of the generator is specified to be 5% above the network rated voltage. Accroding to the above description, ...
A.
6 kV
B.
6.15 kV
C.
6.3 kV
D.
6.6 kV
【单选题】The windlass shall be able to work continuously for _____ at the rated speed of the rated load,
A.
30 minutes
B.
1 hour
C.
1.5 hour
D.
20 minutes
【单选题】Rated current of the thermal relay is according to ( ).
A.
the rated current of the motor
B.
main circuit current
C.
control circuit of current
D.
electric heating element of the current selection
【单选题】Rated current of the thermal relay setting according to the rated current of the motor, generally choose ( ) times of the motor rated current.
A.
1.5-2.5
B.
3-5
C.
0.95-1.05
D.
5-7
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