在风险识别过程中应遵循的原则是( )。A．由粗及细，由细及粗 B．严格界定风险内涵并

在具有PCI/ISA总线结构的奔腾机中，打印机一般是通过打印接口连接到下列哪一种总线上的？

A．CPU局部总线

B．PCI总线

C．ISA总线(AT总线)

D．存储器总线

管径在（）mm以上的可燃气体管道着火时，不可直接关闭阀门熄火，应当采取逐渐降低气体压力，并通过大量水蒸气或氮气灭火的措施，但气体压力不得低于50～100Pa。

A.100

B.128

C.150

阅读下列材料，然后回答后面的问题。

材料一

中 * * 党党纲如下：(一)以无产阶级革命军队推翻资产阶级，由劳动阶级重建国家，直接消灭阶级差别；(二)采用无产阶级专政，以达到阶级斗争的目的——消灭阶级；(三)废除资本私有制，没收一切生产资料，如：机器、土地、厂房、半成品等，归社会所有；(四)联合第三国际。
——《中 * * 党纲领》

材料二

中 * * 党是无产阶级政党。他的目的是要组织无产阶级，用无产阶级斗争的手段，建立劳农专政的政治，铲除私有财产制度，渐次达到一个 * * 主义社会……中 * * 党为工人和贫农的利益在这个联合战线里奋斗的目标是：(一)消除内乱，打倒军阀，建设国内和平；(二)推翻国际帝国主义的压迫，达到中 * * 完全独立；(三)统一中国本部(东三省在内)为真正民主共和国。
——《中共二大宣言》

材料一提出的革命目标是什么？

从历史上看，黄金价格与石油价格的走势呈（）关系。

A.正相关

B.负相关

C.无关

D.弱相关

Yellowstone Weather
Yellowstone National Park is at high altitude. Most of the park is above 7,500 feet (2,275 meters).
Yellowstone’s weather is unpredictable. In summer, it may be warm and sunny with temperatures in the high 70F. At night in any given month, the temperature may drop close to freezing. So it is best to come prepared for cold evenings and mornings, especially if you are camping or hiking. When you leave your campsite, please leave it prepared for possible thundershowers and wind.
A sunny warm day may become fiercely stormy with wind, rain, sleet and sometimes snow. Without enough clothing, an easy hike or boat trip can turn into a battle for survival.
Seasonal Weather Information
Spring
Cold and snow continue into May, although temperatures gradually climb Early in spring, daytime temperatures average in the 40F to 50F; by late May and June, they may reach the 60F and 70F. Nighttime lows fall below freezing.
Summer
Daytime temperatures are usually in the 70F, occasionally reaching the 80F in the lower elevations (高度). Nights are cool, temperatures may drop in the 40F and 30F—sometimes even the 20F. June can be cool and rainy; July and August tend to be somewhat drier, although afternoon thundershowers are common.
Fall
Weather can be pleasant, although temperatures average 10-20 degrees lower than summer readings. Nighttime lows can fall into the teens and lower. Snowstorms increase in frequency as the weeks go by or towards the end of the fall season.
Winter
Temperatures often stay near zero throughout the day, occasionally reaching high in the 20F. Subzero nighttime lows are common. Annual snowfall averages nearly 150 inches in most of the park. At higher places, 200 -400 inches of snow have been recorded.

The author writes this passage most probably for those who plan to ______ in Yellowstone National Park.

A．do research work

B．take a business trip

C．have sports games

D．spend their holidays or take a tour