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问题 选择题

主族元素原子失去最外层电子形成阳离子，主族元素的原子得到电子填充在最外层形成阴离子．下列各原子或离子的电子排布式错误的是（　　）

A．Ca2+：1s22s22p63s23p6

B．Ar：1s22s22p63s23p6

C．Cl-：1s22s22p63s23p6

D．O2-：1s22s22p4

答案

A、钙原子失去2个电子变成钙离子，使次外层变成最外层，所以钙离子核外有18个电子，故A正确．

B、氩是18号元素，原子核外有18个电子，故B正确．

C、氯原子核外有17个电子，氯原子得一个电子变成氯离子，最外层由7个电子变成8个电子，所以氯离子核外有18个电子，故C正确．

D、氧原子核外有8个电子，氧原子得2个电子变成氧离子，最外层电子数由6个变成8个，所以氧离子核外有10电子，故D错误．

故选D．

问答题

The attitude of some top management used to be "The machine belongs to the company; the worker is made for the machine; or, the worker belongs to the company and exists to satisfy its needs." Entertaining such a perspective today would border on lunacy (精神错乱), although managers can be found who act as though they still prescribe to it. The simple fact is that no employee works primarily to satisfy the needs of any organization. He labors first and foremost to meet his concern for the welfare of the firm. Additionally, the leader soon learns to accept his people as he finds them rather than as he would like them to be. Even if he is unhappy with their performance, he knows that the only possible starting point, for improvement, is where they are and as they are at a given time. Five facts are at the heart of any mutual perception process. First, initial impressions tend to be lasting as well as erroneous, it is necessary not only that the manage-leader perceive his people accurately but that he make it easy for them to see him as he is without sham or flimflam (欺诈). Second, a person perceives what he looks for and very little else. This means that the manager should emphasize the positive in sizing up his people. If he is aware of their limitations, he is also conscious of the fact that he will not make much progress with them by focusing on deficiencies. Far too much time is wasted in most organizations on attempts to eradicate defects. It would be wiser to concentrate on capitalizing on assets and building strengths. Third, needs govern perceptions. At the outset of any relationship, there is bound to be some uncertainty on both sides. If he is an unframed picture to his subordinates, the manager realizes that they are not sure just how to go about relating to him. His responsibility is to be authentic in his dealings with them and open to interaction with them. Authenticity and openness in dealing with his subordinates ’’will help them satisfy their need to know where they stand, how they should relate to him, what kind of person he is, and how he intends to manage. Then they will get a true picture of him and how he operates without wasting time second-guessing and playing games with him. The fourth fact is that attitudes govern perceptions. A positive, supportive attitude is readily sensed by employees, who, even if they are school-dull, are generally life-bright. Finally, perceptions are really transactions between the people involved. As the leader must allow his people opportunities to interact with him, so he must also interact with them. In this way, both will make the getting-to-know-you process efficient and rapid.

What does the phrase “on unframed picture to his subordinates" mean

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多项选择题

甲公司向乙公司订购一批彩电，双方在合同中未约定双方的履行顺序，则（）。

A.应由乙公司先交付冰箱，甲公司再付款

B.应由甲公司先付款，乙公司再交付冰箱

C.甲公司在乙公司交付冰箱前有权拒绝其付款要求

D.甲公司应在收到货物的同时付款

E.乙公司应在收到货款的同时交货
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