关于文件系统的描述中，正确的是( )。
A．文件系统独立OS的服务功能
B．文件系统管理用户
C．文件句柄是文件打开后的标识
D．文件表简称为BIOS
参考答案：C
解析：在文件I/O中，要从一个文件读取数据，应用程序首先要调用操作系统函数并传送文件名，并选一个到该文件的路径来打开文件。该函数取回一个顺序号，即文件句柄(File Handle)，该文件句柄对于打开的文件是唯一的识别依据。BIOS是基本输入输出系统的缩写。
A man was walking along the street when he saw a woman struggling with a large package（包裹）. It was half in and half out of her car. He was a kind of man so he went up to the woman and said, "Let me give you a hand with that package. It looks very ." "That's very kind of you," the woman said. "I'm having a lot of with it. I think it's stuck." "Together we'll soon move it," the man said. "I'll get into the and take the other end." "Oh, that's very . Thank you so much," the woman said gratefully. He got into the back of the car and took hold of the other end of the package. "Right," he said, "I'm ready." And he began to push with all his . For several minutes the man and the woman struggled with the package. Soon they were both red in face and out of . "Let's pause for a minute," the man said. "You're right. It really is ." They paused for a few to wipe the perspiration from their faces and get their breath back. Then the man said, "Let's try again. Are you ?" They took hold of the package again. "One, two, three!" the man said, and again they their struggle with the package. At last, when they were both , the man said, "I'm sorry, but the package really seems to be stuck. I don't think there's any way we can get it out of the car." "Get it out of the car!" the woman cried. "You fool! I'm trying to get it in!"
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