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【简答题】
两块带电的平行金属板相距10cm.两板之间的电势差为 9 × 10 3 V,在两板间与两板等距离处有一粒尘埃,带有 - 1 . 6 × 10 -7 C的电荷,这粒尘埃受到的静电力是多大 ? 这粒尘埃在静电力的作用下运动到带正电的金属板,静电力做的功是多少 ?
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举一反三
【单选题】神经肌肉本体促进法(PNF)中：慢反向
A.
相互拮抗的肌肉的交替的等张收缩
B.
接着作主动肌的等张收缩
C.
拮抗肌与主动肌同时的等张收缩
D.
增加运动模式中无力成分的活动范围与耐力
E.
拮抗肌的等张收缩、松弛
【简答题】神经肌肉本体促进法(PNF)中,慢反向
【单选题】In a matrix of transition probabilities (where i equals the row number and j equals the column number),
A.
each number represents the conditional probability of being in state j in the next period given that it is currently in the state of i
B.
each number represents the probability that if something is in state i, it will go to state j in the next period
C.
the number in row 3, column 3 represents the probability that something will remain in state 3 from one period to the next
D.
the probabilities are usually determined empirically
E.
All of the above
【单选题】The Matrix , usually analyzed as a blockbuster or sciencefiction, could also be classified as___________.
A.
comedy
B.
gangster
C.
fantasy
D.
action
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