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问题 单项选择题

一遥控玩具小车在平直路上运动的位移—时间图象如图，则（）

A.15s末汽车的位移为300m

B.20s末汽车的速度为-1m/s

C.前10s内汽车的加速度为3m/s2

D.前25s内汽车做单方向直线运动

答案

参考答案：B

单项选择题

关于顺直河段的航行条件，下列说法哪个不正确（）.

A、常存在江心洲

B、受风影响大

C、主流位置不易判断

D、断面形态基本对称
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单项选择题

A corporation being analyzed has a return on equity (ROE) of 14.3 percent compared to the industry average of 11.8 percent. Which of the following statements about the company, based on the DuPont equation, could explain the higher than average ROE （）

A. The net profit margin is lower than the industry average, but the company is using a higher proportion of debt financing than the industry average.

B. All of the statements could explain the higher than average ROE.

C. The asset turnover is lower than the industry average, but the net profit margin is higher than the industry average.
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