椭圆流量计属于()式流量计。
A、质量
B、重量
C、体积
D、容积
参考答案:D
Food, gas and vegetables have been ________ by rail directly to the city ever since the highways
were blocked.[ ]
A. preferred
B. transported
C. packed
D. rescued
游泳的人用手和脚向后划水,人就前进,下列说法正确的是[ ]
A.人是施力物体不是受力物体
B.水是施力物体同时也是受力物体
C.水是施力物体不是受力物体
D.人先给水一个推力,然后水也给人一个推力