题干

上的投影为轴上的投影为2,且,则

A:

B:

C:

D:

上一题 下一题 0.0难度 选择题 更新时间:2013-05-19 01:43:25

答案(点此获取答案解析)

B

同类题1

选择合适的选项完成短文。

    The key to losing weight is to understand what really motivates you. have you ever been excited about losing a few pounds?____ And to help you keep your weight under control, you need some coping strategies.

    Ask questions. When you're researching different dieting products and plans or even talking to a doctor about diets, ask as many questions as you can.____Ask questions like: Do I have to purchase special meals or supplements? Does the program include a part to help me maintain my weight loss?

    Get real.____Don't burden yourself with unrealistic expectations. Remember, large amounts of weight loss are not realistic and are most likely not safe or healthy. Talk with your health care professional to determine a healthy weight goal.

    ____To maintain your weight, you must balance your intake of calories with the energy you burn. Just 30 minutes of fast walking in most days can take about 10 pounds off your weight each year.

    Weight yourself weekly. It's important to track your weight on any diet or weight loss plan, but don't get on the scale every day. weighing daily won't show you the big picture.____

A. Stay balanced.

B. Once a week is fine.

C. Stick with your healthy eating plan.

D. Losing one to two pounds a week is a realistic goal.

E. Being well informed will help you choose the best diet for you.

F. Regular weight check-ins will show you your progress over time.

G. If so, you must find a way to turn that excitement into determination.

同类题3

下表是小张同学在学习了“近代前期中国人民反侵略、求民主的斗争”之后的一个小结。你能从中提取的正确信息是
时期
领导阶级
斗争纲领或指导思想
重大斗争
19世纪中期
农民阶级
平均主义
太平天国运动
19世纪末
资产阶级
兴民权、君主立宪
维新变法运动
19世纪末20世纪初
农民阶级
扶清灭
义和团运动
20世纪初
资产阶级
三民主义
辛亥革命