歌舞娱乐放映游艺场所内建筑面积小于等于()m2的房间可以设置一个疏散门。A、30 B

Three rich ladies met every day by the river. They sat there and talked the w   71   day. Once, they quarreled. One of them said, "Look, how white and beautiful my hands are!" A   72   one said, "My hands are more beautiful." The third one said. “Mine a   73   the most beautiful." Just then, an old woman beggar（乞丐） came up to them. "Beautiful ladies," she said, "I’m old and can’t work. I’m hungry.  Please give me something to eat."

But the t   74   ladies gave her nothing. They only asked her to tell them who h   75  the most beautiful hands.

A peasant woman (农妇) was also sitting by the river. She was poor and her hands were rough（粗糙） because of h   76   work. The old woman beggar came up to her and said, "I’m hungry. Please give me something to eat." The peasant woman took out her only cake she had and gave the beggar a h   77  .

The old woman beggar ate it and drank some water. Then she took the peasant woman by the hand, brought her b   78   the rich ladies and said, "Now, I shall tell you whose hands are the most beautiful. The hands of the poor peasant woman are rough because of work, but they give us food; they are m    79   more beautiful than your hands which have never d 80   anything."

张辉是一家外企的人力资源主管，但公司领导好像对人力资源管理不太注重，工作招聘及配置很随意，没有科学的规划和设计，比如需要做什么事了才会设置个岗位，根据领导的喜好来选择人才，甚至专门为他设一个工作岗位。因此，公司里人员状况混乱，晋升考核全是看领导，没有客观的标准，而且谁也说不清各个部门的职责和权限，大家都是做一天和尚撞一天钟，工作基本上没效率。根据以上资料，回答下列问题：

公司之所以出现这种情况，问题在于（）。

A.没有工作分析

B.考核制度不完善

C.激励机制不健全

D.员工懒散

某公司的年销售额为400万元， 目前其信用条件为1/10，n/30；有50%的顾客享有折扣，有40%的顾客在信用期间来付款，其余10%的顾客则在信用期间过后10天付款。该公司变动成本率70%，其应收账款的资金成本为10%，虽然该公司每年花5万元来收账，但仍有2.5%的销货款无法收回， 目前该公司打算实行新的信用政策，把销货条件改为2/10， n/40，并同时放宽信用标准及放松账款的催收，从而使收账费用降为2万元。实行新的政策后，年销售额将会增为530万元，而且有60%的顾客会取得折扣，未享受折扣的50%的顾客将在信用期结束付款，另50%的顾客会拖延10天才付款，在新政策下该公司坏账损失将约为销售额的6%。请问：该公司应否改变信用政策

下列分子的电子式书写正确的是（　　）

A．MgCl₂

B．CCl₄

C．CO₂

D．Na₂O

挂机在启动前应做哪些检查工作？