如图所示,在距地面高为H=45 m处,有一小球A以初速度水平抛出,与此同时,在A

题型:计算题

问题:

如图所示,在距地面高为H=45 m处,有一小球A以初速度水平抛出,与此同时,在A的正下方有一物块B也以相同的初速度同方向滑出,B与地面间的动摩擦因数为,A、B均可看做质点,空气阻力不计。求:

(1)A球从抛出到落地的时间; 

(2)A球从抛出到落地这段时间内的水平位移;

(3)A球落地时,A、B之间的距离。

考点:匀变速直线运动
题型:计算题
选词完成句子。每题1分,共10分 从所给的词或词组中挑选出10个,并用其适当形式填入句中。
 be concerned about       be sentenced to death   on purpose   as if
because of   make use of    such as    ever since   equal   ignore
graduate    actually     reliable        disagree      rescue    
小题1:He is a/an ___________ man. You can turn to him whenever you are in trouble.
小题2: There is no doubt that the man who murdered his wife and children _________________________.
小题3:Everybody outside is carrying an umbrella _______________ it is raining.
小题4:Animals __________rabbits and deer continue to be active all winter,finding food wherever they can .
小题5:___________then, he never stopped searching for new and better ways to do things.
小题6:He has been working in that factory after his _______________ from the technical school.
小题7:He pretended to be asleep but________, he was awake.
小题8:To attract his attention, she broke a glass ____________.
小题9:Not all men are _________ in ability. That is to say, some men are able while others may not be so able.
小题10: My mother is devoted to our family and she ______________our family no matter where she is.
题型:计算题

排入河流的两排放口的间距较近时,可以简化为一个,其位置假设在(),其排放量为两者之和。

A.排污量较大的排放口

B.两排放口之间

C.任意一个排放口

D.排污量较小的排放口

题型:计算题

在进行项目计划前,应该首先建立 (14) 的目的和范围,考虑可选的解决方案、标识技术和管理的约束。没有这些信息,就不可能进行合理的成本估算、有效的风险评估、适当的项目任务划分或是可管理的项目进度安排。

A.人员
B.产品
C.过程
D.计划

题型:计算题

糖皮质激素的适应证不包括______。

A.创伤修复期
B.抗菌药物不能控制的感染
C.糖尿病
D.严重高血压
E.风湿性关节炎

题型:计算题

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