经济利润与会计利润的主要区别在于经济利润扣除了债务利息也扣除了股权资本费用。 (

以下是教材购销系统的描述，请仔细阅读并按要求回答问题。

某图书管理系统有以下功能：

A．借书：输入读者借书证，系统首先检查借书证是否有效。然后检查该读者所借图书是否超过10本，若已达到，拒借；未达到10本，办理借书，修改库存并记录。

B．还书：从借书文件中读出与读者有关的记录，查阅所借日期，如果超期(1个月)做罚款处理；否则，修改库存目录与借书文件。

C．查询：可通过借书文件、库存目录文件查询读者情况，图书借阅情况及库存。

画出该图书管理系统的控制流程图。

下表中是某同学做“研究液体的压强”时所测的部分数据．

（1）实验次数1、4、5说明______；

（2）实验次数1、2、3说明______．

Motivation is "the driving force within individuals that impels them to action." And goals are the sought-after results_____(1) motivated behavior.Motivation can be either positive or negative_____(2) direction. We may feel a driving force toward some object or condition, _____(3) a driving force away from some object or condition. For example, a person may be impelled toward a restaurant to fulfill a need, hunger, and away_____(4) an airplane to fulfill a need of safety. Some psychologists refer to positive drives_____(5) needs, wants or desires,_____(6) negative drives as fears or aversions._____ (7), though negative and positive motivational forces seem to differ dramatically_____(8) terms of physical and sometimes emotional activity, they are basically similar in_____(9) they both serve to initiate and sustain human behavior.____(10) this reason, researchers often refer _____(11) both kinds of drives or motives as needs, wants and desires.Goals, _____(12), can be either positive or negative. A positive goal is one toward_____ (13) behavior is directed and it is often referred to as an approach object. A negative goal is _____(14) from which behavior is directed away and it is sometimes referred to as an avoidance object. Since both approach and avoidance goals can be considered objectives of motivated behavior, most researchers refer to_____(15) types simply as goals. Consider this example. A middle-aged woman may wish to remain_____(16) attractive as possible. Her positive goal is to appear desirable, and_____(17) she may use a perfume advertised to make her irresistible. A negative goal may be to prevent her skin_____(18) aging, and therefore she may buy and use face creams._____(19) the former case, she uses perfume to help her achieve her positive goal — attractiveness; in the____(20) case, she uses face creams to help avoid a negative goal — wrinkled skin.

在大雨天行车，为了避免发生“水滑”而造成危险，要控制车速行驶。

杜能圈所指的6个同心农业圈是指：自由式农业、林业和（）。

A.轮作式农业

B.谷草式农业

C.三圃式农业

D.畜牧业

E.无人利用的荒地