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班轮运费计收标准中的“W/M Plus Ad. Val. ”是指计收运费时，应选三者中较高者计收。( )
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重量公吨和尺码公吨统称为运费公吨。( )
在使用磁盘高速缓存的系统中，平均的访问时间是80.6ms，高速缓存的平均访问时间是1ms，磁盘平均访问时间是200ms，系统有8MB的高速缓存。高速缓存增加一倍时，非命中率将降低40%。问需要增加多少高速缓存才能将平均访问时间减少到20ms(假定高速缓存的数据按2的倍数增加)。
E "Go for it !" The expression "Go for it!" is a way of encouraging someone to try something. "Go for it!" means you should not worry about failure or be too careful. You should take a chance, be brave, and act firmly. "Go for it !" gets its name from football. Not football as it is played in most countries such as England, Egypt or Japan, but the kind of football played in the United States and Canada. One of the most exciting times in football comes when a team has failed, after three attempts, to move the ball forward ten yards. The team must make a critical decision. The conservative (保守) choice is to kick the ball and accept temporary defeat in order to gain a good position for your team the next time it gets the ball. The more exciting choice, however, is to try a fourth and final time to gain the remaining yards needed. People present are certain to shout their advice. Some will shout: "Kick the ball!" But others will encourage the team to take a chance. "Go for it!" they will scream. In the 1980s, people began using this expression in many kinds of situations to encourage someone to act bravely. There is no guarantee (保证) that the action you "go for it" will succeed. But that is the chance you take when you decide to go for it. You put your fears behind. You choose courage over safety. You hold your breath and go for it. The expression "Go for it!" comes from ______.
先天性心脏病
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