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问题 选择题

下列关于机械运动的描述，正确的是（　　）

A．只有机械设备的运动才是机械运动

B．物体的一切运动都是机械运动

C．空气的流动不是机械运动

D．灰尘的运动属于机械运动

答案

答案：D

单项选择题



What does the speaker mean a. These results prove that the quality of the teaching is not very good. b. These results are not convincing to prove anything. c. These results are not reliable to prove anything. d. These results are not obtained in a scientific way.
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单项选择题

肾病综合征无下列哪种症状（）

A.高脂血症

B.蛋白尿

C.类脂质尿

D.尿钙排出多

E.凹陷性水肿
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