还有一道英文物理题an air-filled ballon floating on the surface of the water is in a region where the currrent in the water has a velocity Vc and the wind has a velocity Vw.the actual velocity of the ballon is given by:A.Vc+VwB.Vc-VwC.Vw-VcD.

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还有一道英文物理题an air-filled ballon floating on the surface of the water is in a region where the currrent in the water has a velocity Vc and the wind has a velocity Vw.the actual velocity of the ballon is given by:A.Vc+VwB.Vc-VwC.Vw-VcD.
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还有一道英文物理题an air-filled ballon floating on the surface of the water is in a region where the currrent in the water has a velocity Vc and the wind has a velocity Vw.the actual velocity of the ballon is given by:A.Vc+VwB.Vc-VwC.Vw-VcD.
还有一道英文物理题
an air-filled ballon floating on the surface of the water is in a region where the currrent in the water has a velocity Vc and the wind has a velocity Vw.the actual velocity of the ballon is given by:
A.Vc+Vw
B.Vc-Vw
C.Vw-Vc
D./Vc/-/Vw/
E./Vw/-/Vc/
pls tell me why

还有一道英文物理题an air-filled ballon floating on the surface of the water is in a region where the currrent in the water has a velocity Vc and the wind has a velocity Vw.the actual velocity of the ballon is given by:A.Vc+VwB.Vc-VwC.Vw-VcD.
你可以设一个正方向啊.要是相反正好减去,相同的时候减去一个负的不就等于加上正的么.所以选加绝对值的那个,去掉绝对值可以带一负号,不知道你懂了没有.体会下

还有一道英文物理题an air-filled ballon floating on the surface of the water is in a region where the currrent in the water has a velocity Vc and the wind has a velocity Vw.the actual velocity of the ballon is given by:A.Vc+VwB.Vc-VwC.Vw-VcD. 一道英文(sat2)物理题 ()()Air 英文 fill-air有什么用?(或sealed air呢?) an air of disappointment 不要机器的.还有帮忙分析一下语法.比如 air是不可数的.为什么加an 一道英文版的物理题,rockets are launched from an airplane in the forward direction of motion.the kinetic energy of the airplane will bea.unchangedb.increasedc.decreased 一道物理题, 一道物理题, 一道物理题, 一道物理题, 一道物理题, an air-conditioner翻译 一道力学与运动学还有能量问题的综合物理题 问一道高中物理题（风向和飞机航向的）问题原文an airplane can fly with a maximum air velocity of 750hm/h[N].If the wind velocity is 60km/h[15°E of N],what must be the plane's ground velocity if it is to remain on a course going s 我在天猫超市买东西,他在箱子里放了好几袋这个FILL-AIR.有什么用?是SEALED AIR FILL-AIR He assumed an air of concern.中的an air of 用an actor air造句, There is an air port.