如图所示,光滑水平桌面上的小滑块P和Q都可视作质点,MP>MQ,Q与轻质弹簧相连

题型:选择题

问题:

如图所示,光滑水平桌面上的小滑块PQ都可视作质点,MP>MQQ与轻质弹簧相连.Q静止,P以某一初速度向Q运动并与弹簧发生碰撞,一段时间后P与弹簧分离.在这一过程中,正确的是:

A.P与弹簧分离时,Q的动能达到最大

B.P与弹簧分离时,P的动能达到最小

C.PQ的速度相等时,弹簧的弹性势能达到最小

D.PQ的速度相等时,P的动能达到最小

考点:机械能守恒定律
题型:选择题

某期货公司在一起债务纠纷中败诉,标的额为200余万元,胜诉方向人民法院申请强制执行。根据以上资料,回答下列问题。 

关于执行问题,下面说法正确的有()。

A.人民法院在执行会员资格费或者交易席位时,可以采取强制措施转让该交易席位 

B.人民法院在执行会员资格费或者交易席位时,应当按照期货交易所相应规则或者与期货交易所协商,处理好该交易席位的转让事宜 

C.人民法院执行会员资格费或者交易席位时,应当依法裁定不得转让该会员资格,但不得停止该会员交易席位的使用 

D.人民法院在执行会员资格费或者交易席位时,可以直接将该席位拿到社会上拍卖,出价最高者获得该席位资格

题型:选择题

下图所示的实验装置和结果,可以证明哪个是种子萌发的条件?

[ ]

A.光

B.温度

C.水分

D.空气

题型:选择题

下列关于建设工程项目管理规划的叙述,( )是正确的。

A.建设项目的其他参与单位不需要编制项目管理规划
B.业主方不能委托总承包方编制建设工程项目管理规划
C.建设工程项目管理规划涉及项目从施工阶段至保修期
D.建设工程项目管理规划必须随着情况的变化而进行动态调整

题型:选择题

对心室收缩特性的描述可概括为三大模型,不包括以下()。

A、液压模型

B、泵模型

C、几何形体模型

D、数学模型

题型:选择题

Drug use is rising dramatically among the nation’ s youth after a decade of decline. From 1993 to 1994, marijuana use among young people (1) from 12 to 17 jumped 50 percent. One in five high school seniors (2) marijuana daily. Monitoring the Future, which (3) student drug use annually, reports that negative attitudes about drugs have declined for the fourth year in a row. (4) young people see great risk in using drugs. Mood-altering pharmaceutical drugs are (5) new popularity among young people. Ritalin, (6) as a diet pill in the 1970s and now used to (7) hyperactive children, has become a (8) drug on college campuses. A central nervous system (9) , Ritalin can cause strokes, hypertension, and seizures. Rohypnol, produced in Europe as a (10) tranquilizer, lowers inhibitions and suppresses short-term memory, which has led to some women being raped by men they are going out with. (11) taken with alcohol, its effects are greatly (12) . Rock singer Kurt Cobain collapsed from an (13) of Rohypnol and champagne a month before he committed (14) in 1994. In Florida and Texas, Rohypnol has become widely abused among teens, who see the drug as a less expensive (15) for marijuana and LSD. Alcohol and tobacco use is increasing among teenagers, (16) younger adolescents. Each year, more than one million teens become regular smokers, (17) they cannot legally purchase tobacco. By 12th grade, one in three students smokes. In 1995, one in five 14-year-olds reported smoking regularly, a 33 percent jump (18) 1991. Drinking among 14-year-olds climbed 50 percent from 1992 to 1994,and all teens reported substantial increases in (19) drinking. In 1995, one in five 10th graders reported having been drunk in the past 30 days. Two-thirds of high school seniors say they know a (20) with a drinking problem.

2()

A.tastes

B.smokes

C.injects

D.takes

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