方程x2•sinA+2x•sinB+sinC=0有两等根，则△ABC的三边a，b

电力需求侧管理是电力公司采取有效的（）和诱导措施以及适宜的运作方式，与用电客户共同协力提高（），改变（），为减少（）和电力需求所进行的管理活动。

角膜炎的并发症不包括（）

A.前房积脓

B.后弹力层膨出

C.角膜瘘

D.后极白内障

E.角膜葡萄肿

柴油机运行，怠速或略低于中速时活塞销发出声响且声响清晰，发出有节奏的“嗒嗒”声，转速变化时声响更大，发动机温度上升时响声不减，甚至明显。单缸断火声响减弱或消失，此故障原因一般是（）。

A.主轴承盖曲轴栓松动；轴承径向间隙过大；轴承润滑不良，造成烧煅或脱落

B.气门间隙过大，或凸轮磨损，顶动挺杆有跳动，气门杆与导管磨损松旷

C.凸轮轴弯曲，轴径与轴承松旷

D.活塞销与座孔或连杆小头铜衬套配合松旷

Questions 3—4 are based on the following:
Magazine editor: I know that some of our regular advertisers have been pressuring us to give favorable mention to their products in our articles, but they should realize that for us to yield to their wishes would actually be against their interests. To remain an effective advertising vehicle we must have loyal readership, and we would soon lose that readership if our readers suspect that our editorial integrity has been compromised by pandering to advertisers.
Advertising-sales director: You underestimate the sophistication of our readers. They recognize that the advertisements we carry are not articles, so their response to the advertisements has never depended on their opinion of the editorial integrity of the magazine as a whole.

The magazine editor’s argument assumes which one of the following

A．A magazine editor should never be influenced in the performance of his or her professional duties by the wishes of the companies that regularly advertise in the magazine.

B．The magazine cannot give any favorable mention in its articles to its regular advertises without compromising its reputation for editorial integrity.

C．Favorable mention of their products in the magazine’s articles is of less value to the advertisers than is the continued effectiveness of the magazine as an advertising vehicle.

D．Giving favorable mention to a product in a magazine article is a more effective form of advertising than is an explicit advertisement for the product in the same magazine.

E．(E) Carrying paid advertisements can never pose any thread to the magazine’s reputation for editorial integrity nor to the loyalty of its readership.

Windows 2000内置的支持多媒体功能的组件中，能够从模拟视频采集数字视频信号，将数据进行压缩后存储到文件中，并对视频信息进行处理的是 【10】 。