Close Contents Introduction Podcast Beta Questions and Answers More Actions PDF Questions Make a copy Study Flashcards Play Quiz Podcast Beta Play an AI-generated podcast conversation about this lesson 0.7x 0.9x 1x 1.1x 1.3x 1.5x 1.7x 2x Questions and Answers Download PDF PDF Questions PDF Answers 以下哪个是最正确的? 选项二 选项一 (correct) 选项四 选项111 以下哪个是正确的? 选项四 选项一 选项三 选项二 (correct) 以下哪个是正确的? 选项二 选项三 (correct) 选项四 选项一