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问题 单项选择题

某系统的进程状态转换如下图所示。图中 1、2、3 和 4 分别表示引起状态转换时的不同原因。原因 4 是由于 （9） ；一个进程状态转换会引起另一个进程状态转换的是 （10）。运行阻塞就绪 1 2 3 4

（10）是（）

A．1→2

B．2→1

C．3→2

D． 2→4

答案

参考答案：B

单项选择题

(一) Today our knowledge of food and what it does for our bodies are far more advanced than that of the old times. Now we know about vitamins and how each kind of vitamin helps in the growth of a particular, the food that we eat will take care of our body and so there is no need to take any kinds of vitamins unless our doctor tells us that our bodies are short of something which can be supplied by them. Generally speaking, everything we eat does some good to our body. But if we eat too much of one kind of food and pay too little attention to others, we may have too much of one kind and not enough of others. Then we may be in trouble. We are often told that we must eat some meat at each meal in order to get the necessary proteins. That is only partly true, for proteins are not found only in meat. We can also get them from some vegetables. The best advice about what to eat is that we should eat all kinds of food but never too much of any.

Proteins are found______

A．only in meat

B．in all kinds of food

C．more in vegetables than in meat

D．in some vegetables as well as in meat
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单项选择题

某企业材料总分类账户本期借方发生额为16000元，本期贷方发生额为15000元，其有关明细分类账户的发生额分别为：甲材料本期借方发生额3500元，贷方发生额4500元：乙材料本期借方发生额10500元，贷方发生额为9000元；则丙材料本期为( )。

A．借方发生额13500元，贷方发生额为14000元

B．借方发生额2000元，贷方发生额为1500元

C．借方发生额1000元，贷方发生额为2000元

D．因不知各账户期初余额，故无法计算
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