题目:
如果|m|=-m,则m的取值范围是______.
答案:
∵|m|=-m,
∴-m≥0,
∴m≤0.
故答案为:m≤0.
如果|m|=-m,则m的取值范围是______.
∵|m|=-m,
∴-m≥0,
∴m≤0.
故答案为:m≤0.
Some pioneering work that began as an attempt to discover ways to increase production efficiency led to the founding of the human relations movement in industry and to the development of motivational skills and tools for managers. In 1927 researchers were involved in determining the optimum amount of lighting, temperature, and humidity (with lighting being considered the most important) for the assembly of electronic components at Western Electric. The researchers found that lighting had no consistent effect on production. In fact, production sometimes increased when lighting was reduced to the level of ordinary moonlight! The important part of this experiment began when two Harvard researchers, Elton Mayo and Fritz Roethlisberger, were brought in to investigate these unexpected results further. They found that workers were responding not to the level of lighting but to the fact that they were being observed by the experimenters. This phenomenon came to be known as the Hawthorne effect since the experiments were conducted at the Western Electric Hawthorne Plant. This was the first documented and widely published evidence of the psychological effects on doing work, and it led to the first serious effort aimed at examining psychological and social factors in the workplace. Further experiments were continued for five years. Generally, the researchers concluded from their experiments that economic motivation (pay) was not the sole source of productivity and, in some cases, not even the most important source. Through interviews and test results, the researchers focused on the effects of work attitudes, supervision, and the peer group and other social forces, on productivity. Their findings laid the groundwork for modem motivation theory, and the study of human factors on the job, which continues to this day in such common practices as selection and training, establishing favorable work conditions, counseling, and personnel operations. The contributions of this experiment shifted the focus of human motivation from economics to a multifaceted approach including psychological and social forces. |
The research became known as the "Hawthorne effect" because
A.it was the name of the plant where the study was conducted
B.it was the name suggested by the Harvard researchers
C.it was the name of the principal experimenter
D.There were Hawthorne plants growing at Western Electric where the study was conducted
由锥体外系病变所致的是()
A.痉挛型构音障碍
B.弛缓型构音障碍
C.失调型构音障碍
D.运动过多型构音障碍
E.混合型构音障碍
白附片加工时()
A.圆锥形或羊角状,表面灰黄色或棕褐色
B.不规则的团块或长圆形,表面灰黑或灰棕色
C.圆柱形,略弯曲,表面灰棕色至暗棕色,有节、芽、叶柄基和根痕
D.扁圆柱形,表面灰黄色,外皮横向断裂而露出木部,形似连珠
E.根茎粗短,下生根数条,表面棕红或暗棕红色
反映证券组合期望收益水平的总风险水平之间均衡关系的方程式是( )。
A.证券市场线方程
B.证券特征线方程
C.资本市场线方程
D.套利定价方程
抗原的基本性质是()
A.异物性和特异性
B.免疫原性与免疫反应性
C.抗原性与异物性
D.理化复杂性与特异性
E.异物性和免疫反应性