如有两列频率不同的声波在空气中传播，已知频率为ν1=500Hz的声波在其传播方向上相距为l的两点的振动相位差为π，那么频率ν2= 1000Hz的声波在其传播方向上相距为l/2的两点的相位差为
When we do oil painting, we need ___. A. watercolors B. oil paints C. crayons D. pastels 相关知识点: 试题来源: 解析 B。进行油画创作时,我们需要油画颜料。A 选项“watercolors”是水彩颜料;C 选项“crayons”是蜡笔;D 选项“pastels”是彩色粉笔。所以选 B。 反馈 ...
1 By ___ coincidence, oil paints were developed at the time when ___technique of perspective was used.A. a ; the B ; a C. ; the D. a; a 2By ___ coincidence, oil paints were developed at the time when ___technique of perspective was used.A. a ; the B ; a C. ; the...
By ___ coincidence, oil paints were developed at the time when ___technique of perspective was used. A. a ; the B \ ; a C. \; the D. a; a 试题答案 在线课程 【答案】 C 【解析】 试题分析:考查冠词。第一空的固定词组by coincidence偶然;第二空特指透镜,望远镜的技术。故C正确。 考点...
By coincidence, oil paints were developed at the time when technique of perspective was usedA.a ; theB.\ ; aC.\; theD.a; a
I had suddenly run out of oil paints just when I needed them. So I made the long 1 to the only store around here that sells them. It was the 2 time to shop. The store was full of people and the checkout line was long. I could see the 3 on the faces of the people around me...
I had suddenly run out of oil paints just when I needed them. So I made the long 1 to the only store around here that sells them. It was the 2 time to shop. The store was full of people and the checkout line was long. I could see the 3 on the faces of the people around m...
eim e Amy was seven, sh e had begun painting with oil paints When al art class, her teacher was amazed at her unusual styl e of painting ork was similar in som e ways to th e paintings by famous artists like Peopl e started to call her "littl e Picasso". Th e interesting thing ...
探究点一inventv.发明IthinktheTVwasinventedafterthecar.我认为电视是在汽车之后被发明的。Unit6Whenwasitinvented第1课时SectionA(1a-2d)点睛beinvented是invent的被动语态结构,意为“被发明”。常用结构有:beinventedin...被发明于……;beinventedby...由……发明。TheelectriclightbulbwasinventedbyEdison.爱迪生...
He devoted much of his time to learning the fundamentals of drawing.Van Gogh believed that to become a great painter,one must first master the ability to draw.It was only after he was comfortable in this area that he began to use oil paints.That is when he developed...