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【判断题】
公牛遇敌害时,常表现戒备行为,把头低下,目光直射对方,前脚刨地吼叫,后肢挺直前进,具有威吓姿势。A.
正确
B.
错误
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举一反三
【单选题】According to the passage, heroes are compared to high-voltage transformers in that ______.
A.
they have a vision from the mountaintop
B.
they have warm feelings and emotions
C.
they can serve as concrete examples of noble principles
D.
they can make people feel stronger and more confident
【单选题】For ideal transformers, a primary input voltage can be transformered to a desired secondary voltage by a suitable choice of ( ).
A.
internal impedance
B.
power factor
C.
turn ratio
D.
excitation impedance
【单选题】— How did you find the film Transformers 3 (变形金刚3)？ — _____. I can't think too highly of it. [ ]
A.
It makes no sense
B.
It's really amazing
C.
It's up to you
D.
By chance.
【简答题】一般将促使物体发生运动的力称为主动力,比如重力。而约束力是在物体有运动或运动趋势的情况下,约束对非自有体的作用力,随主动力的变化而变化,因此约束力是【 】。
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