题目内容
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)。
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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 ______.
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男孩，8个月。生后易患肺炎、肠炎，常伴皮疹，呈湿疹样。两个舅舅分别因“败血症”及“急惊风”早夭。体检：营养发育稍差，苍白，两颊有湿疹样皮疹，躯干与两下肢见瘀点、瘀斑，咽稍充血，心肺正常，肝肋下2cm，脾肋下1cm，神经系统正常。血红蛋白98g/L，白细胞11×109/L，中性粒细胞0.56，淋巴细胞0.44，血小板56×109/L。 为明确该病，应进行下列哪项检查
可转换公司债券是一种可以在特定时间、按特定条件转换为普通股股票的特殊企业债券。( )
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