最常见的子宫肌瘤是（）。
A.子宫颈息肉
B.子宫颈肌瘤
C.肌壁间肌瘤
D.浆膜下肌瘤
E.黏膜下肌瘤
参考答案：C
When an object is dropped, the number of feet N that it falls is given by the formula , where t is the time in seconds since it was dropped and g is 32.2, if it takes 5 seconds for the object to reach the ground, how many feet does it fall during the last 2 seconds ？（）
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, where t is the time in seconds since it was dropped and g is 32.2, if it takes 5 seconds for the object to reach the ground, how many feet does it fall during the last 2 seconds ？（）