关于速度和加速度的说法正确的是（ ）
A．甲物体比乙物体速度大，则甲的加速度一定比乙的大
B．甲物体的加速度比乙物体大，则甲一定比乙的速度变化快
C．加速度逐渐减小，而速度逐渐增大是不可能的
D．可能存在加速度方向不变，而速度方向改变的情况
BD
题目分析：速度描述运动的快慢，加速度描述速度变化的快慢，所以速度大的加速度不一定大，所以A错误；加速度大的速度变化快，所以B正确；当加速度的方向与速度的方向相同时，即使加速度在减小，物体也做加速运动，所以C错误；若加速度与速度的方向不在一条直线上，物体做匀变速曲线运动，加速度不变而速度方向时刻改变，故D正确。
| The basic story is very old indeed and familiar to most of us. The heroine, Cinderella, is treated cruelly by her stepmother and mocked by her two ugly stepsisters. And even though her father loves her, she can’t tell him how unhappy she is because her stepmother has bewitched him. One day Cinderella’s stepmother and stepsisters are invited to a ball at the royal palace. Cinderella is told she cannot go and is understandably very unhappy. However, her fairy godmother comes to the rescue and, waving her magic wand, produces some beautiful clothes for Cinderella as well as a carriage to convey her to the ball. There, she dances with the handsome prince, who falls in love with her… Just a sweet, pretty tale Not in the view of Ellen Macintosh, who has written extensively about fairy tales. "This story features the stock, two-dimensional characters of most fairy tales, and little character development is attempted," she says. Indeed, although her comment does make one wonder why simplicity of this sort should be out of place in a story for children. Be that as it may, Ellen’s main problem is with what the story implies. "Instead of standing up to her cruel stepmother and absurd stepsisters, Cinderella just waits for a fairy godmother to appear and solve her problem. But wouldn’t you want a daughter of yours to show more spirit " The story is enduring, whatever its shortcomings, and it doesn’t take much in the way of analytical skills to see its influence on a number of recent Hollywood productions, all aimed at girls aged five to fifteen. In these versions for the silver screen, the Cinderella character no longer has to clean the house and has no siblings to make her life a misery, though she persists in not showing much backbone. The character of the rich and handsome stranger, however, is retained, and in some cases really is a prince. The role of the fairy godmother is often played by coincidence or sheer luck; we live in an enlightened age when even very young children might reject the notion of fairies. The wicked stepmother may be transformed into a villain of some sort. In the majority of film versions, the heroine has a profession and is even permitted to continue working after marrying her prince — this is the twenty — first century, after all. Doesn’t the success of these films indicate that the story has relevance to children even today "Yes," admits Ellen, who sees its message as being rooted in a fundamental childhood desire for love and attention. "Most children experience a sense of inner loneliness as they are growing up and empathies with the protagonist who faces some sort of test or challenge. This can be seen in the original story of Cinderella, where the fairy godmother tells the heroine that she must learn to be gracious and confident if she is to go to the ball. She has to grow spiritually, and by maturing, she becomes attractive to the prince, thus ensuring that the ending of the story will be happy." "In the later versions, this element is missing," says Ellen, "and the theme of the story is simply that a girl’s role in life is to be more beautiful than other little girls so that she can carry off the prize: the handsome prince. Is this really what we want girls to grow up believing " |
According to the passage, modern variants on the story generally ______.
A．(A) portray Cinderella as a successful professional
B．(B) imply that Cinderella will become a real princess
C．(C) reflect children’s beliefs and aspirations
D．(D) make concessions to modern women’s lives
| 某施工单位承接了一座桥梁的桩基施工任务，由于该任务专业性强，所以在劳动力组合管理方面采取了部门控制式管理方式。 该桥桩基直径为1.2m，采用正循环钻孔灌注施工工艺，主要工序有：埋设护筒、制备泥浆、钻孔、清底、钢筋笼制作与吊装及水下灌注混凝土。钻孔泥浆由水、黏土和添加剂组成。现场配备了一台混凝土搅拌设备，混凝土运输距离较远。 在施工中，由于水下混凝土未连续浇注，以及导管埋深控制不当等原因，其中一根桩发生了断桩事故，项目部及时进行了处理，并制订了一系列的防治措施。 |
施工单位采用的劳动力管理方式的特点有( )。
A．按职能原则建立项目组织
B．建立的组织机构一般适用于小型的、专业性强的项目
C．从接受任务到组织运转启动时间较短
D．管理人员是由项目经理直接领导
E．项目经理无须专门训练便容易进入状态