单项选择题

当物体打击安全帽时，帽壳不因受力变形而直接影响到头部。安全帽应当正确使用，下列关于安全帽使用的说法错误的是（　　）

A.作业中不得将安全帽脱下，搁置一旁
B.帽衬顶端与帽壳内顶必须保持5～10mm的空间
C.必须系好下颌带
D.安全帽必须戴正、戴稳
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单项选择题
施工现场立体交叉作业时，下层作业位置应处于上层作业坠落半径之外。上层作业高度为25m时，坠落半径为（ ）m
A.3
B.4
C.5
D.6
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'The first and best of victories is for a man to conquer himself; to be conquered by himself is, of all things, the most shameful,' says Plato. Self-control is at the root of all the advantages. Let a man give in to his impulses and feelings, and from that moment he gives up his moral freedom.A single angry word has lost many a frienD.When Socrates found in himself any temper or anger, he would check it by speaking low in order to control himselF.If you are conscious of being angry, keep your mouth shut so that you can hold back rising anger. Many a person has dropped dead in great anger. Fits of anger bring fits of diseasE.'Whom the gods would destroy they first make maD.''Keep cool', says Webster, 'anger is not argument. ''Be calm in arguing', says George Herbert,' for fierceness makes error a fault.'To be angry with a weak man is to proye that you are not strong yourselF.'Anger', says Pythagoras,' begins with folly and ends with regret. 'You must measure the strength of a man by the power of the feelings he conquers, not by the power of those which conquer him.Self-control is man's last and greatest victory.If a man lacks self-control he seems to lack everything. Without it he can have no patience, no power to govern himself; he can have no self-confldence, for he will always be controlled by his strongest feeling. If he lacks self-control, the very backbone and nerve of character are lacking also.What does the reader learn from the first paragraph?A.The greatest victory for a man is to conquer everything except himselF.B.One's moral freedom is based on the control of himselF.C.To control oneself is the most difficult in one's lifE.D.ff a person holds his own feelings, he will feel most shameful.
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