题干

下列叙述中,正确的是(  )

A:在一个基态多电子的原子中,可以有两个运动状态完全相同的电子

B:在一个基态多电子的原子中,不可能有两个能量完全相同的电子

C:在一个基态多电子的原子中,M层上的电子能量肯定比L层上的电子能量高

D:如果某一基态3p能级上仅有2个电子,它们自旋方向必然相反

上一题 下一题 0.0难度 选择题 更新时间:2019-05-26 08:02:11

答案(点此获取答案解析)

C

同类题1

阅读理解

    There are many weight loss products,plans and programs in the market.However,if most of these programs were effective,we would see obesity trends reversing,yet we are witnessing more and more people struggling with weight.

    Experiences of dieters regaining pre-dieting weight within 5 years are common.Therefore,a fitness program that works over a long period of time is something you should be looking for.Before reaching for your wallet or purse,make sure the program is exactly what it claims to be.

Professional endorsement(认可)

    A good program should not insist on offering pills, injections, powders or similar products that are not endorsed by a medically trained professional.You choice of programs should have been designed by a medically trained professional.

Unreallstic promises

    A good program should not make unrealistic promises,such as“To lose 5 pounds in a week,with no exercise!” Therefore,it is advisable to judge whether the promises being made are realistic.The plan should also have a high success rate of weight loss.

Qualification

    A weight loss program should consider the health of the applicants.It should consider their age,medical condition,gender,health background,medication and more,in order to make a plan that meets the needs of every applicant.A good program should include diet and exercise in order to promote permanent and good health.

Restriction

    A good program should not overly restrictive(限制的)on food allowances.Some programs ask you not to eat foods from the main nutrient food groups like fruit and vegetables.A successful weight loss plan,for most people,should not involve less than 1,200 calories per day.

Cost effective

    A long-term program does not have to cost you lots of money.An effective plan that is reasonably priced can save you a large sum of money that can be spent on other healthy habits.This car in turn improve your lifespan.

    We provide the best information about weight loss program.For further details please visit the provided links.