【判断题】Synchronized swimming is a hybrid of swimming, dance and gymnastics.
【单选题】人体必需脂肪酸a一亚麻酸按其双键位置属于
【单选题】以下对n-3脂肪酸的叙述,正确的是
E.
从甲基端数起,第一个不饱和键在第三和第四碳原子之间的各种不饱和脂肪酸
【单选题】______ being fun and good exercise, swimming is a very useful skill.
【单选题】______ fun and good exercise, swimming is a very usefull skill.