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【单选题】
For the speed regulation for a DC driving motor of an electric propulsion system, we can use a ______.
A.
voltage type invertor
B.
current invertor
C.
PWM frequency convertor
D.
DC transformer
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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】The ______ can change an AC power source into a DC one.
A.
rectifier
B.
ransformer
C.
convertor
D.
invertor
【单选题】The muscles of the lateral compartment of the leg include:
A.
an evertor of the foot
B.
an invertor of the foot
C.
a dorsiflexor of the ankle
D.
an extensor of the fifth digit (toe)
E.
one which attaches to the sustentaculum tali
【单选题】Which of the following statements is true according to the text?
A.
In leaving behind a well-meant will, Alfred Nobel succeeded in building a permanent monument for his interests and ideals.
B.
Alfred Nobel made a glorious will so that he might be remembered and respected after his death.
C.
In his famous will Alfred Nobel expressed his wish that a monument should be put up in memory of him as a scientist and invertor.