某企业要建设信息系统平台,要求系统可用性达到99.99%。系统 A 平均无故障时间 10000 小时,故障平均维修时间 1 小时;系统 B 平均无故障时间 14000 小时,故障平均维修时间1.5 小时。一下说法中,正确的是( )。 A只有系统 A 符合可用性要求 B系统 A 和系统 B 均符合可用性要求 C只有系统 B 符合可用性要求 D系统 A 和系统 B 都不符合可用性要求
【简答题】阅读理解。 One Sunday afternoon Mr Green and his child, Mary, are in a big shop. Mr Green likes Mary and wants to buy a new dress for her. Mary doesn't like the new dress. She likes something to eat. So he...
【简答题】阅读理解。 One Sunday afternoon Mr Green and his child, Mary, are in a big shop. Mr Green likes Mary and wants to buy a new dress for her. Mary doesn't like the new dress. She likes something to eat. So he...
【简答题】Lily is a healthy girl. She likes to eat vegetables and fruits every day. She has eggs, milk, bananas and bread for breakfast. For lunch, she likes sandwiches, carrots and apples. And she eats chicken...
【简答题】阅读理解。 Jack likes eggs, bananas and apples. So every day, he has two eggs, one apple, a cup of milk and some bread for breakfast. He likes vegetables a lot. For lunch, he has bananas, some chicken and...