到2020年，珠江—西江经济带（）处理处置率达到100%，沿岸所有乡镇及以上城镇生活

第15～26题使用的数据表如下：
当前盘当前目录下有数据库：学院.dbc，其中有“教师”表和“学院”表。
“教师”表

职工号	系号	姓名	工资	主讲主课程
11020001	01	肖海	3408	数据结构
11020002	02	王岩盐	4390	数据结构
11020003	01	刘星魂	2450	C语言
11020004	03	张月新	3200	操作系统
11020005	01	李明玉	4520	数据结构
11020006	02	孙民山	2976	操作系统
11020007	03	钱无名	2987	数据库
11020008	04	呼延军	3220	编译原理
11020009	03	王小龙	3980	数据结构
110200010	01	张国梁	2400	C语言
110200011	04	林新月	1800	操作系统
110200012	01	乔小廷	5400	网络技术
110200013	02	周兴池	3670	数据库
110200014	04	欧阳秀	3345	编译原理

　　　　　　　　“学院”表

系号	系名
01	计算机
02	通信
03	信息管理
04	数学

有SQL语句；
SELECT学院．系名,COUNT(*)AS教师人数FROM教师，学院；
WHERE教师．系号；学院．系号GROUPBY学院．系名
与如上语句等价的SQL语句是 ______。

A．SELECT学院．系名,COUNT(*)AS教师人数；
FROM教师INNER JOIN学院；
教师．系号二学院．系号GROUP BY学院．系名

B．SELECT学院原名,COUNT(*)AS教师人数；
FROM教师INNER JOIN学院；
ON系号GROUP BY学院．系名

C．SELECT学院．系名,COUNT(*)AS教师人数；
FROM教师INNER JOIN学院；
ON教师．系号=学院，系号GROUP BY学院．系名

D．SELECT学院．系名,COUNT(*)AS教师人数；
FROM教师INNERJOIN学院；
ON教师．系号=学院．系号

一台并联在电网上运行的同步发电机，若要在保持其输出的有功功率不变的前提下，增大其感性无功功率的输出，可以采用下列哪种办法

A．保持励磁电流不变，增大原动机输入，使功角增加

B．保持励磁电流不变，减小原动机输入，使功角减小

C．保持原动机输入不变，增大励磁电流

D．保持原动机输入不变，减小励磁电流

寒武纪与寒武系所表征的意义不同。( )

Like every language, American English is full of special expressions, phrases that come from the day-to-day life of the people and develop in their own way. Our expression today is "to face the music".
When someone says, "well, I guess I’ll have to face the music, " it does not mean he’s planning to go to the concert. It is something far less pleasant, like being called in by your boss to explain why you did this and did that, and why you didn’t do this or that. Sour music indeed, but it has to be faced. At sometime or another, every one of us has had to face the music, especially as children. We can all remember father’s angry voice, "I want to talk to you. " and only because we did not obey him. What an unpleasant business it was!
The phrase "to face the music" is familiar to every American, young and old. It is at least 100 years old. And where did this expression come from The first explanation comes from the American novelist, James Fenimore Looper. He said, in 1851, that the expression was first used by actors while waiting in the wings to go on the stage. When they got their cue to go on, they often said, "Well, it’s time to face the music. " And that was exactly what they did—facing the orchestra which was just below them. And an actor might be frightened or nervous as he moved on to the stage in front of an audience that might be friendly or perhaps hostile, especially if he forgot his lines. But he had to go out. If he did not, there would be no play. So the expression "to face the music" come to mean "having to go through something, no matter how unpleasant the experience might be, because you knew you had no choice".
Other explanations about the expression go back to the army. When the men faced an inspection by their leader, the soldiers would be worried about how well they looked. Was their equipment clean, shinny enough to pass the inspection Still the men had to go out and face the music of the band as well as the inspection. What else could they do
Another army explanation is more closely related to the idea of facing the results and accepting the responsibility for something that should not have been done. As, for example when a man is forced out of the army because he did something terrible, he is dishonored. The band does not play. Only the drums tap a sad, slow beat. The soldier is forced to leave, facing such music as it is and facing the back of his horse.

The underlined word "hostile" means ______.

A. unfriendly


B. dislike
C. unkind



D. unnecessary

下图为我国某地等高线地形图，读图完成下列问题。

图示区域内M悬崖最大相对高差可能为（）

A．99米

B．149米

C．199米

D．201米