问题
单项选择题
船舶在波浪中的横摇摆幅取决于船舶自由横摇周期和与波浪的遭遇周期：（）.
A.船舶自由横摇周期越大，横摇摆幅越大
B.船舶与波浪的遭遇周期越大，横摇摆幅越大
C.船舶自由横摇周期和船舶与波浪的遭遇周期之差越大，横摇摆幅越大
D.船舶自由横摇周期和船舶与波浪的遭遇周期之差越小，横摇摆幅越大
答案
参考答案：D
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船舶在波浪中的横摇摆幅取决于船舶自由横摇周期和与波浪的遭遇周期：（）.
A.船舶自由横摇周期越大，横摇摆幅越大
B.船舶与波浪的遭遇周期越大，横摇摆幅越大
C.船舶自由横摇周期和船舶与波浪的遭遇周期之差越大，横摇摆幅越大
D.船舶自由横摇周期和船舶与波浪的遭遇周期之差越小，横摇摆幅越大
参考答案：D
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| Not long ago, the only time you could see a robot was when you were reading a novel or watching a movie such as Star Wars. Today, 1 a lot of things in science stories have been science facts. Robots are starting to 2 in our everyday lives. These robots have different sizes, shapes and colors. But they all have the same 3 of man-made " 4 ". Leading the robot revolution (革命) are industrial robots that work in factories. Industrial robots can do different kinds of jobs that are often 5 and sometimes dangerous. Robots are also coming to American homes, though not as quickly as they are entering 6 . These robots aren't as friendly and 7 as those you saw in Star Wars. But, their makers say, today's home robots "walk" and sense objects in their own way. They even 8 objects though they may sometimes drop. Well, nobody is 9 . We may 10 home robots today, but some day they may see and hear 11 than humans do. We 12 can only see certain wave lengths of light and hear certain 13 . That's because the 14 of our eyes and ears are 15 . Robots, however, need not have the same limits 16 we have. Robots may also be 17 wit devices (装置) that 18 information humans can't. However, to understand 19 their sensing devices pick up is a hard job. Remember, man-made brains 20 information, including all kinds of data, as zeroes and ones. Imagine the difficulty in trying to explain to a robot what a football looks like-using only zeroes and ones. | ||||
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