【单选题】()既学习了分类、又学习了不同大小形状积木的摆放方法。
【简答题】力是矢量,其三要素是 、方向和作用点,力对一点为矩心的转动效应用 衡量,力的国际单位是 ,力矩的国际单位是 。
【单选题】M :Kate, how do you like this dress? It looks perfect. W: I'm afraid the color is too light. It easily gets dirty, Peter. M: Then how about this one ? W: Great. How much is it ? M: I am not sure, we m...
【单选题】A: What time is this meeting supposed to begin? B: I' m not sure. I thought it was to start at 7:00 p. m. , but it’s already 7: 20 p. m. . A: ______ B: It’s unlikely that the guest speaker has arrived...
A.
What do you think the problem is?
【单选题】I ’ m not sure then — they ______ be antelopes.
【简答题】力的三要素是(),(),(),单位为()和KN。
【简答题】力偶的三要素是力偶矩的 、 和 。用符号表示力偶矩的单位为 或 。
【简答题】在国际单位制中,力的单位是____,符号为____;力的作用效果跟力的____、____和____有关,它们叫做力的三要素。重力的作用点叫____。