滤料的不均匀系数是指能通过（）%滤料的筛孔孔径与能通过（）%滤料的筛孔孔径之比。

卫星电话信号需要通地球同步卫星传送。如果你与同学在地面上用卫星电话通话，则从你发出信号至对方接收到信号所需最短时间最接近于（可能用到的数据：月球绕地球运动的轨道半径约为3.8×10⁵m/s，运行周期约为27天，地球半径约为6400千米，无线电信号传播速度为3×10⁸m/s）[ ]

A.0.1s

B.0.25s

C.0.5s

D.1s

规范：是指人们在特定环境下被要求如何行动、如何思维、如何体验的期望。
根据以上的定义，下面哪种行为体现了规范( )

A．一职工在公共澡堂沐浴时，突然遭到抢劫，该职工毫不掩饰地就冲出澡堂与歹徒厮打起来
B．为了提高本班学生的成绩，一教师暗地里增加了每个学生的期末考试成绩
C．在一次盛大的宴会上，王海身着背心和短裤，脚踏拖鞋进入了大厅
D．医生在治疗病人时表现得镇定、稳重、富有同情心、责任感

土地使用权出让合同约定的使用年限为50年，原土地使用者使用10年后转让，受让人的使用年限为( )年。

A．10
B．30
C．40
D．50

Medical research findings are customarily not made public prior to their publication in a medical journal that has had them reviewed by a panel of experts in a process called peer review. It is claimed that this practice delays public access to potentially beneficial information that, in extreme instances, could save lives. Yet prepublication peer review is the only way to prevent erroneous and therefore potentially harmful information from reaching a public that is ill equipped to evaluate medical claims on its own. Therefore, waiting until a medical journal has published the research findings that have passed peer review is the price that must be paid to protect the public from making decisions based on possibly substandard research.
The argument assumes that

A．unless medical research findings are brought to peer review by a medical journal, peer review will not occur.

B．anyone who does not serve on a medical review panel does not have the necessary knowledge and expertise to evaluate medical research findings.

C．the general public does not have access to the medical journals in which research findings are published.

D．all medical research findings are subjected to prepublication peer review.

E．(E) peer review panels are sometimes subject to political and professional pressures that can make their judgments less than impartial.

一个液晶显示器，换到一个电脑上，加电没有显示。原因可能是（）。

A.重新加载显示器驱动程序

B.分辨率太低

C.分辨率太高

D.更新BIOS