进行控制系统的投运之前需要做的准备工作有（）A、熟悉生产工艺过程 B、全面检查过程检

1801年，托马斯·杨用双缝干涉实验研究了光波的性质，1834年，洛埃利用单面镜同样得到了杨氏干涉的结果（称洛埃镜实验）。

（1）洛埃镜实验的基本装置如图所示，S为单色光源，M为一平面镜。试用平面镜成像作图法在图上画 出S经平面镜反射后的光与直接发出的光在光屏上相交的区域。

（2）设光源S到平面镜的垂直距离和到光屏的垂直距离分别为a和L，光的波长为λ，在光屏上形成干涉条纹。写出相邻两条亮纹（或暗纹）间距离Δx的表达式。

训练模拟子系统的主要组成部分有训练模拟工作站和()训练应用软件。

(A)报警受理台 

(B)灭火救援指挥 

(C)报警通信网 

(D)数据库

女，60岁。突发剧烈头痛、呕吐3小时。查体：神清，颈强直。头颅CT提示蛛网膜下腔出血。首选的辅助检查是（）

A.MRA

B.MRI

C.脑电图

D.脑血管造影

E.经颅多普勒

根据《大气污染防治法》规定，单位燃用不符合质量标准的煤炭、石油焦的，由（）责令改正，处货值金额一倍以上三倍以下的罚款。

A.县级以上人民政府

B.市级以上人民政府

C.县级以上人民政府环境保护主管部门

D.市级以上人民政府环境保护主管部门

Many animals engage in play，but homo sapiens is the only animal (1) have invented sports.Since sports are an invention，a part of culture (2) than an aspect of nature，all definitions of sports are somewhat arbitrary. (3) sports are a human universal found in every known culture or a (4) unique to modern society depends upon one’s definition of sports.Men and (5) have always run，jumped，climbed，lifted，thrown， and wrestled，but they have (6) always performed these physical activities competitively. Although all literate societies seem to (7) contests of one sort or another in which men， and sometimes women， (8) in displays and tests of physical skill and prowess，sports may be (9) defined as physical contests performed for their own sake and not for (10) ulterior end.According to this strict definition，neither Neolithic hunters nor contestants (11) religious ceremonies such as the ancient Olympic Games were engaged in sports. (12) on the stipulation that sports must be performed for their own sake (13) the paradoxical elimination of many activities which are usually thought of as (14) ，such as exercises done for the sake of cardiovascular fitness，races run (15) satisfy a physical education requirement，ball games played to earn a paycheck. (16) definition also means abandonment of the traditional usage in which"sport，"derived (17) Middle English disporter，refers to any light hearted recreational activity.In the. (18) of some 18th- century aristocrats，a game of backgammon and the seduction of (19) milkmaid were both considered good sport，but this usage of the term (20) become archaic.