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【单选题】
下列关于速度的说法中正确的是( )A.
速度是表示物体运动快慢的物理量，它既有大小，又有方向，是矢量
B.
平均速度就是速度的平均值，它只有大小没有方向，是标量
C.
瞬时速率有时简称速率，它表示瞬时速度的大小，是矢量
D.
在直线运动中，瞬时速度与平均速度相等
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【简答题】短文改错。 Two friend met a bear when they went through a forest by foot. One of them ran to nearest tree and climbed up very quick. He forgot his friend. He thought only of herself. His friend knew bears ...
【单选题】They went through the rooms, being careful to touch nothing, as they did not Want to ______ the police in their search for fingerprints.
A.
intervene
B.
hint
C.
hamper
D.
reverse
【简答题】设 在 上连续,且 ,则证明不等式 。
【简答题】设 在 上连续,且 ,则证明不等式:
【单选题】The journey was adventurous and they went through great hardship, but it .
A.
paid back
B.
paid off
C.
paid for
D.
paid out
【单选题】They went through the rooms, being careful to touch nothing, as they did not want to ______ the police in their search for fingerprints.
A.
intervene
B.
hint
C.
hamper
D.
reverse
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