Radar is not only to obtain ______, but also to measure their distance away from you.A.brightness of objectsB.color of targetsC.shape of targetsD.bearing of objects
Radar is not only to obtain ______, but also to measure their distance away from you.
A.brightness of objects
B.color of targets
C.shape of targets
D.bearing of objects
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Dick was a sailor on a big ship. It went to Japan and Australia, __21__ Dick was often on the ship for several months at a time. When he woke up in the morning and looked out, he only saw the sea, __22__ sometimes a port.When he was twenty-four, Dick __23__ and bought a small house with a garden in his wife's town. It was far away fromthe sea. Then he had to go back to his ship, and he __24__ home for two months. He went from the port to the town by bus, and was very happy to see his wife again.The next morning he slept until 9 o'clock. Then he woke up suddenly and looked out of the window. There were trees a few feet __25__. He was very frightened and jumped out ofbed, shouting, "We've hit land!"21.A.orB.did not comeC.soD.got marriedE.away22.A.orB.did not comeC.soD.got marriedE.away23.A.orB.did not comeC.soD.got marriedE.away24.A.orB.did not comeC.soD.got marriedE.away25.A.orB.did not comeC.soD.got marriedE.away
15、实平面上任意一点到原点的距离函数可以定义为 distance :: Float - Float - Float distance x y = ... distance x y 表示坐标点（x,y)到原点（0, 0)的距离。请判断下面哪些表达式是类型错误的。A．distance (1,2)B．distance (1+2)C．distance (1+2) 5D．distance (1+2) (2+3)