对于乙烯装置开车方案，关键路线上的工序越多，总体试车所需时间越长。因此，应尽可能把并

按照决策的重要性划分，可以将决策划分为（）

A.战略决策和战术决策

B.程序化决策和非程序化决策

C.确定型决策和不确定型决策

D.个人决策和团体决策

E.重要决策和不重要决策

海洋表层的运动主要受海平面风的牵制。信风的存在使得大量暖水被吹送到赤道西太平洋地区，而赤道东太平洋地区暖水被刮走后，主要靠海面以下的冷水进行补充，因此，赤道东太平洋海温比西太平洋海温明显偏低。当信风加强时，赤道东太平洋深层海水涌升上翻现象更加剧烈，导致海表温度异常偏低，使得气流在赤道太平洋东部下沉，而气流在西部的上升运动更为加剧，有利于信风的加强，这进一步加剧了赤道东太平洋冷水的发展，引发了所谓拉尼娜现象。 这段文字主要谈的是：

A．海表运动与信风的关系

B．赤道东西太平洋海温差异的原因

C．拉尼娜现象的形成原理

D．信风的存在对海温的影响

脑脓肿CT表现分哪几期（）

A.急性脑炎期

B.急性脑炎晚期

C.化脓期

D.病灶吸收期

E.包膜形成期

There are no exact differences between physics and other natural sciences because all sciences overlap(重叠）.In general,however,physics is the scientific study of forces and qualities such as heat,light,sound,pressure,gravity and electricity,and the ways they affect other objects.

One major branch of physics deals with the states of matter—solids,liquids and gases and with their motions.The pioneer achievements of Galileo,Kepler and Newton dealt with solid masses of matter in motion.Such studies deal with forces acting on moving objects.It is the subject of mechanics and belongs to the branch of mechanics called dynamics,the study of matter in motion.This large topic includes not only the motions of stars and ping-pong balls but also the motions of the water pumped by a fire engine and those of the air passing through the jet engine of an airplane.

A branch of mechanics is statics(静力学）,the study of matter at rest.The designs of buildings and bridges are examples of problems in statics.Other branches of physics are based on the different kinds of energy,which interact with matter.They deal with electricity and magnetism（磁力）,heat,light,and sound.From these branches of physics scientists find clues(线索） which have revealed(揭示） the constructions of atoms and how the atoms react to various kinds of energy. This knowledge is often called the basis of modern physics.Among the many subdivisions（细的分支）of modern physics are electronics and nuclear physics.Physics is closely related to engineering.A person who uses knowledge of physics in solving everyday problems is often called an engineer.For example,electricity is one of the branches of physics;and an electrical engineer is a man who uses the “natural laws” of electricity to help in designing and electric generator(电动机）.

小题1:Physics is not exactly different from other natural sciences because_________.

A．physics and other natural sciences have parts in common

B．it is the scientific study of forces and qualities such as heat,light and sound

C．it studies the ways in which forces and qualities affect other objects

D．it is a part of other natural sciences小题2:The following statements are included in the study of dynamics except_________.

A．the design and construction of skyscrapers

B．the motions of heavenly bodies

C．the motions of water pumped by a fire engine

D．the motions of the air passing through the jet engine of an airplane小题3:Among many branches of modern physics is _________.

A．states

B．electricity

C．electronics

D．mechanics小题4:This knowledge” in Paragraph Three refers to_________.

A．electricity and magnetism,light and sound

B．the construction of atoms and their reactions to various kinds of energy

C．the basis of modern physics

D．electronics and nuclear physics

某病人长期咳嗽，咳痰每日量约300ml，如咳痰不畅时则呈弛张型发热，此时血象的变化是

A．中性粒细胞增加
B．嗜酸性粒细胞增加
C．红细胞减少
D．红细胞增加
E．淋巴细胞增加