【单选题】2 .若 a , b ∈ R , i 是虚数单位, a + 2 018i = 2 - b i ,则 a 2 + b i = () A. 2 018 ＋ 2i B. 2 018 ＋ 4i C. 2 ＋ 2 018i D. 4 － 2 018i

Activity 2 Watch the video clip and check(√)the topics that are mentioned.1 the definition of an e-book A: Mentioned. B: Not mentioned.

‏018 大象喝水 通过码‌

018 大象喝水 通过码

Which of the following statements about image texture is correct: refers to which characteristics of the image? ( ) A: Image texture is the relative brightness of objects in the image B: Image texture is the apparent roughness of an image region C: Image texture is the apparent smoothness of an image region D: Image texture is the frequency of tonal change on an image

1. For an image with 100 * 100 pixels, each pixel has 8-bits to express its gray scale.If the data volume of the compressed image is 40000 bits after Huffman coding , the compression ratio of the image is ( ). A: A. 4:1 B: B. 3:1 C: C. 1:2 D: D. 2:1

<2>以下数值中,不正确的八进制数或十六进制数是()。 A: 0x16 B: 016 C: 018 D: 0xaaaa

下列四组选项中，均是合法转义字符的选项是( )。 A: ‘？ ’‘“’‘ ’ B: ‘A’‘012’‘”’ C: ‘018’‘?’‘xab’ D: ‘\2’‘101’‘xlf’

Which of the following is not a description of image texture? （ ） A: the frequency of tonal change on an image B: the apparent roughness of an image region C: the apparent smoothness of an image region D: relative brightness of objects in the image

Watch the video clip and answer the questions1. According to the video clip, which city is the greenest one in Asia?2. According to the video clip, what makes Copenhagen the top one eco-friendly city in the world?