按区内巷道布置确定的准备方式有()、()、()。

题型:填空题

问题:

按区内巷道布置确定的准备方式有()、()、()。

考点:土木建筑工程钻井工程钻井工程题库
题型:填空题

如图所示,三颗质量均为m的地球同步卫星等间隔分布在半径为r的圆轨道上,设地球质量为M,半径为R.下列说法正确的是(  )

A.地球对一颗卫星的引力大小为

GMm
(r-R)2

B.一颗卫星对地球的引力大小为

GMm
r2

C.两颗卫星之间的引力大小为

Gm2
3r2

D.三颗卫星对地球引力的合力大小为

3GMm
r2

题型:填空题

根据语言环境和表达的需要,填入横线上最恰当的一句是: 又一阵风。风过去了,街上的幌子,小摊,行人,______,全不见了,只剩下柳枝随着风狂舞。

A.风仿佛把它们都卷走了

B.风仿佛都卷走了它们

C.仿佛都被风卷走了

D.一下子消失得无影无踪

题型:填空题

影响统计结论可靠性的因素很多,其中最主要的一个是_________

A.统计方法是否正确

B.因素选择是否正确

C.系统误差过大

D.随机误差过大

E.实验设计是否完善

题型:填空题

如图1中,用大小相同的力作用于弹簧,观察比较两次做法可知力的作用效果与力的______有关;如图2中,用大小相同的力,______(选填“甲”、或“乙”)的握法更利于拧紧或松开螺帽,这说明力的作用效果与力的______有关.

题型:填空题

College sports in the United States are a huge deal. Almost all major American universities have football, baseball, basketball and hockey programs, and (1) millions of dollars each year to sports. Most of them earn millions (2) as well, in television revenues, sponsorships. They also benefit (3) from the added publicity they get via their teams. Big-name universities (4) each other in the most popular sports. Football games at Michigan regularly (5) crowds of over 90, 000. Basketball’s national collegiate championship game is a TV (6) on a par with any other sporting event in the United States, (7) perhaps the Super Bowl itself. At any given time during fall or winter one can (8) one’s TV set and see the top athletic programs--from schools like Michigan, UCLA, Duke and Stanford-- (9) in front of packed houses and national TV audiences.

The athletes themselves are (10) and provided with sch61arships. College coaches identify (11) teenagers and then go into high schools to (12) the country’s best players to attend their universities. There are strict rules about (13) coaches can recruit--no recruiting calls after 9 p. m. , only one official visit to a campus--but they are often bent and sometimes (14) . Top college football programs (15) scholarships to 20 or 30 players each year, and those student-athletes, when they arrive (16) campus, receive free housing, tuition, meals, books, etc.

In return, the players (17) the program in their sport. Football players at top colleges (18) two hours a day, four days a week from January to April. In summer, it’s back to strength and agility training four days a week until mid-August, when camp (19) and preparation for the opening of the September-to-December season begins (20) During the season, practices last two or three hours a day from Tuesday to Friday. Saturday is game day. Mondays are an officially mandated day of rest.

15()

A.offer

B.afford

C.award

D.reward

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