利用量纲分析，相对论变换中的因子γ，它在粒子运动速度接近真空中光速时，会变得（）。A

小鲁是个调皮鬼，经常做错事，惹得父母生气，可是他与父母的关系却很融洽。当别人问他有什么诀窍时，他说：“我有错会认，挨批评会听，会帮父母做事，还会赞赏父母，父母能不喜欢我吗？”这告诉我们[ ]

①与父母保持距离是减少冲突的最佳做法

②在与父母发生矛盾和冲突时，要作出必要的让步和道歉

③当着父母的面听话就行，背地里想怎样就怎样

④要尊重父母对自己提出的意见和建议

A．①②

B．②④

C．①④

D．③④

慢性胃炎最为主要的病因为

A．病毒感染
B．幽门螺旋杆菌感染
C．胆汁返流、胆盐刺激
D．长期服用刺激性食物和药物
E．精神、神经因素

当主导能见度（）跑道视程的值（）时，需要在机场实况报或特殊报的发布中，发布RVR值。

A.或；小于1500米

B.和；等于或小于1500米

C.或；等于或小于2000米

F: We ought not to test the safety of new drugs on sentient animals, such as dogs and rabbits. Our benefit means their pain, and they are equal to us in the capacity to feel pain.
G: We must carry out such tests; otherwise, we would irresponsibly sacrifice the human lives that could have been saved by the drugs.
Which of the following, if true, is the best objection that could be made from F’s point of view to counter G’s point

A．Even though it is not necessary for people to use cosmetics, cosmetics are also being tested on sentient animals.

B．Medical science already has at its disposal a great number of drugs and other treatments for serious illnesses.

C．It is not possible to obtain scientifically adequate results by testing drugs in the test tube, without making tests on living tissue.

D．Some of the drugs to be tested would save human beings from great pain.

E．(E) Many tests now performed on sentient animals can be performed equally well on fertilized chicken eggs that are at a very early stage of development.

按垂直方向，物流信息系统可划分为三个层次（）。

A.信息收集层——信息存储层——信息输出层

B.入库——库存——配送

C.WMS——POS——CRM

D.管理层——控制层——作业层