问题
选择题
After getting lost in a storm, a member of the navy team ________ four days later.[ ]
A. rescued
B. was rescued
C. has rescued
D. had been rescued
答案
答案：B
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After getting lost in a storm, a member of the navy team ________ four days later.[ ]
A. rescued
B. was rescued
C. has rescued
D. had been rescued
答案：B
，当
非常非常小时，
就可以表示物体在t时刻的瞬时速度，该定义应用了极限思想方法。