题目内容

如果函数f(x，y)在(0，0)处连续，那么下列命题正确的是()．

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What is the author's main purpose in the passage？

A. To provide information about the childhood of Paul Revere.
B. To discuss the war between the British and the Americans.
C. To tell the reader a story about Paul Revere in the American Revolution.
D. To describe the courage of the farmers and villagers in the American Revolution.

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This selection could be entitled______.

A. The Function of Radar
B. Problems in Space Navigation
C. Radar for the Space Age
D. Space Stations

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设随机变量X与Y相互独立，且分别服从参数为1与参数为4的指数分布，则P｜x＜y｜＝()．

A. 1／5
B. 1／3
C. 2／5
D. 4／5

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Which of the following statements is implied but not stated？

A. Microwave radar operates at a higher frequency than laser-doppler radar.
B. Laser-doppler radar is more accurate than microwave radar.
C. The light-beam radar can measure only slow speeds with absolute accuracy.
D. Microwave radar does not insure absolute precision in measuring varying speeds.

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