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24.计算机病毒的作用
机制分别称为_______、传染机制、破坏机制。
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22.Fifty volunteers were alphabetically divided into two equal groups, Group A to participate in a 7 week exercise program, Group B to avoid deliberate exercise of any sort during those 7 weeks. On the day before the exercise program began, all 50 men participated in a step-test. This consisted of stepping up down on a 16-inch bench at 30 steps a minute for 5 minutes. One minute after completion of the step-test, the pulse rate of each subject was taken had recorded. This served as the pretest for the experiment. For the next 7 weeks, subjects in the experimental group (Group A) rode an Exercycle (a motor-driven bicycle-type exercise machine) for 15 minutes each day. The exercise schedule called for riders to ride relaxed during the first day's ride, merely holding on to the handle bars foot pedals as the machine moved. Then, for the next 3 days, they rode relaxed for 50 seconds of each minute, pushed, pulled, pedaled actively for 10 seconds of each minute. The ratio of active riding was increased every few days, so that by the third week it was half of each minute, by the seventh week the riders were performing 15 solid minutes of active riding.
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