【多选题】当今世界,有不少国家通过一些论调来抹黑“一带一路”建设,其中包括( )。
【单选题】Not only _______ snacks and drinks, but _______ cards for entertainment when they had a picnic in the forest.
A.
they brought; they also brought
B.
did they bring; they also brought
C.
brought they; did they bring
D.
did they bring; did they also bring
【简答题】如图,在等腰梯形ABCD中,AB=2DC=2,∠DAB=60°,E为AB的中点,将△ADE与△BEC分别沿ED、EC向上折起,使A、B重合于点P,则三棱锥P-DCE的外接球的体积为 。
【简答题】20世纪80年代,顾泠沅领导的青浦数学教学改革实验提出“____、效果回授”的教学策略。
【单选题】如图,在等腰梯形ABCD中,AB=2DC=2,∠DAB=60°,E为AB的中点,将△ADE与△BEC分别沿ED、EC向上折起,使A、B重合于点P,则三棱锥P-DCE的外接球的体积为 [ ] A、
【单选题】—Tom, what about going for a picnic in the national park tomorrow? —________. It is just opened to the public. I am looking forward to it. [ ]
【简答题】涤纶丝缝纫线,双股,捻度约600捻/米,终捻为Z捻,长度为5000米,卷绕成单边宝塔形,经硅油乳液处理,总重量小于1000g( )