如图所示,实线和虚线分别为某种波在t时刻和t+Δt时刻的波形曲线.B和C是横坐标

I like eating fruit and vegetables what are of great benefit to our healthy. Not only do they prevent us from falling into ill, but they help us lose weight. I used to hate vegetables, but follow the doctor’s advice, I gradually kicked the bad habit. Just as an old saying going, “An apple a day keeps the doctor away”. However, there are still many children dislike fruit and vegetables. On contrary, influenced by this or that kind of advertisement, many were crazy about junk food. Consequently, they become weaker and weaker instead of getting strong. In my opinion, we must take action to change them.

立铣刀主要用于铣削什么表面（）

A.平面、斜面和台阶面

B. * * 面、沟槽和台阶面

C.沟槽、键槽

子日：德之不修，学之不讲，闻义不能徙，不善不能改，是吾忧也。孔子那时就忧“德之不修”是因为他看到了道德在个人成长中的作用，今天我们建设中国特色社会主义文化要加强思想道德建设，是因为（）

A.思想道德建设要引导人们树立中国特色社会主义共同理想

B.社会主义荣辱观是社会主义思想道德的集中体现

C.思想道德建设是发展中国特色社会主义文化的重要内容和中心环

D.加强思想道德修养能够促进科学文化修养

生产更多物品总会增加总剩余。