降压斩波器中，电源电压Ud=50V，导通比为0.8，则负载电压平均值ULD为（ ）。

水运冷藏运输主要的类型() A: 冷藏集装器 B: 冷藏船 C: 冷藏集装箱 D: ULD

int.再会n.告别 A: either / ‘aiðə, ‘i:ðə/ B: sweep / swi:p/ C: bold / bəuld/ D: farewell / ‘feə’wel/

n.午餐，(美)便餐 A: reflection / ri’flekʃən/ B: lunch / lΛntʃ/ C: extend / iks’tend/ D: mould / məuld/

a.冷的；冷淡的n.冷 A: lab / læb/ B: cold / kəuld/ C: compute / kəm’pju:t/ D: fast / fa:st/

The 3rd homeworkListen to the following, spell the words in English and translate into Chinese._________________ [ʃeip]• _________________['traiæŋɡl]• ____________[raund]• _______________ ['əuvl]• _______________ [hɑ:t]• _______________ [stɑ:(r)]• _______________ [riŋ]• _______________ [ˈrektæŋɡl]• __________[skweə(r)]• _______________ ['daiəmənd]• _______________ [kju:b]• _______________ [kəʊn]_______________ ['kʌlə(r)]• _______________ [(h)wait] _______________ [blæk]• _______________ ['jeləu] _______________ [ɡri:n]• _______________ [red] _______________ ['silvə(r)]• _______________ ['ɡəuldən] _______________ [piŋk]• _______________ [braun] _______________ [blu:]• _______________ ['pə:pl] _______________ [ɡrei]• _______________ ['aivəri]_______________ [məˈtiəriəl]• _______________ ['leðə(r)] _______________ [klɔθ]• _______________ ['plæstik] _______________ ['rʌbə(r)]• _______________ [ˈmetl] _______________ [wud]_______________ ['tekstʃə(r)]• _______________ [sɔft]• _______________ [hɑ:d]• _______________ ['tendə(r)] _______________ [rʌf]• _______________ [smu:ð] _______________ ['stiki]_______________ [weit ənd ˈvɔlju:m]• _______________ ['sentiˌmi:tə] =(cm)• _______________ ['miliˌmi:tə] =mm• _______________ ['kiləˌmi:tə]=km• _______________ [intʃ] (1 _____ =25.4mm)• _______________ [mail] (1_____=1.609km)• _______________ [ɡræm]=g• _______________ [ˈkiləgræm] =kg.• _______________[paund] (1______=0.4536kg)• _______________ [tʌn]（1______ =1000kg）