【多选题】排球正面双手垫球技术的动作要点是什么?
A.
准备姿势:两肩分开与肩宽,两膝微屈成半蹲,后脚跟微抬起,双手放在体侧边。
B.
手型:两手交叉成叠握拇指并拢手腕压,夹肘不放松。
C.
用力的顺序:两脚之下而上蹬伸,两臂随着摆动腹前触球,身体重心稍前跟。
【简答题】诱导淀粉酶形成,促进麦芽糖化的植物激素是______。促进抽薹开花的是______。
【单选题】--Hey, Joe, why not eat out to celebrate Mum’s birthday? She makes meals for us every day. -- _________
【简答题】五大激素种,诱导淀粉酶形成,促进麦芽糖化的植物激素是______。促进抽薹开花的是______。促进果实成熟的是_______。促进橡胶分泌的是________。
【单选题】Why did Tom want to go and eat out that evening?
A.
Because he was bored with the food his father cooked.
B.
Because he was bored with the home-made food.
C.
Because he liked the atmosphere at the restaurant.
【简答题】在排球技术的正面双手垫球技术中,正确的垫球部位以及垫球的用力顺序是什么?