题目内容
（请给出正确答案）
[多选题]
friction（）
A.摩擦
B.前线
C.霜
D.冲突
答案
AD
如搜索结果不匹配，请 联系老师 获取答案
A.分数
B.小说
C.摩擦
更多“friction（）”相关的问题
第4题
3、正手发下旋球时，用球拍下半部偏前的部分摩擦球的中上部。 In a forehand backspin serve, make friction contact on the ball above its center （upper middle part) by the front lower part of the racket. （B)
点击查看答案
第5题
4、在反手搓球时注意，挥拍击球动作幅度都无需太大，摩擦球的力量要集中。 In backhand push, the swing movement shall not be too large. Concentrate the friction force in contact.
点击查看答案
第6题
一矩形金属线框结有表面张力系数为a的液膜，有一边是可滑动的，其长为L，如果用力F使滑动边匀速且无摩擦地拉开距离x，此时液膜的表面能比原来： A rectangular metal wire frame junction has a liquid film with a surface tension coefficient a, one side of which is sliding and its length is L. if the force F makes the sliding edge move at a constant speed without friction, the surface energy of the liquid film is compared with the original one，
A.增加了2 a Lx Added 2 a Lx
B.增加了2Fx Added 2Fx
C.增加了FL Added FL
D.增加了FLx Added FLx
第7题
3、一矩形金属线框结有表面张力系数为a的液膜，有一边是可滑动的，其长为L，如果用力F使滑动边匀速且无摩擦地拉开距离x，此时液膜的表面能比原来： A rectangular metal wire frame junction has a liquid film with a surface tension coefficient a, one side of which is sliding and its length is L. if the force F makes the sliding edge move at a constant speed without friction, the surface energy of the liquid film is compared with the original one，
A.增加了2 a Lx Added 2 a Lx
B.增加了2Fx Added 2Fx
C.增加了FL Added FL
D.增加了FLx Added FLx
第9题
一矩形金属线框结有表面张力系数为a的液膜，有一边是可滑动的，其长为L，如果用力F使滑动边匀速且无摩擦地拉开距离x，此时液膜的表面能比原来： A rectangular metal wire frame junction has a liquid film with a surface tension coefficient a, one side of which is sliding and its length is L. if the force F makes the sliding edge move at a constant speed without friction, the surface energy of the liquid film is compared with the original one，
A.增加了2 a Lx Added 2 a Lx
B.增加了2Fx Added 2Fx
C.增加了FL Added FL
D.增加了FLx Added FLx
