A:磷酸、脱氧核糖和胸腺嘧啶
B:磷酸、核糖和胞嘧啶
C:脱氧核糖和胸腺嘧啶
D:核糖和尿嘧啶
日本太平洋沿岸工业带形成和发展的主要优势是( )
如图所示,每个滑轮的重为100N,不计摩擦与绳重,用此滑轮组将500 N的重物匀速提升 l m.在此过程中 ( )
⑴Amy ____ A. climbed the Tianshan Mountains yesterday.
⑵Sam ____ B. went to Xinjiang last year.
⑶Lingling ____ C. visited the Tianchi Lake last week.
⑷Daming ____ D. rode a horse last year.
⑸Tom ____ E. went to Beijing last summer holiday.