题型：问答题 简答题 从方框里选择合适的词，根据句子的意思，用其适当形式填空。possible refuse use worry her 小题1:David was badly hurt in the accident, so we were very _______ about him. 小题2:Lily’s family can’t afford her education. So she always teaches _______. 小题3:They invited me to the party, but I had to________ because I was very busy. 小题4:It is bad for our eyes to watch TV too much . I think it’s ________ true.小题5:Did she ________to have long hair when she was in Grade Seven? 查看答案
题型：问答题 简答题 如图所示，光滑水平面上静止放着长L=2.0m、质量M=3.0kg的木板。一个质量m=1.0kg的小物体放在离木板右端d=0.40m处，m与M之间的动摩擦因数0.10，现对木板施加水平向右的拉力F=10N，为使木板能从物体下方被抽出，此拉力作用不得少于多少时间? 查看答案
题型：问答题 简答题 以下程序执行后的输出结果是 #include＜iostream＞ using namcspace std； void try(int,int,int,int)； int main() int x，y，z，r； x=1; y=2; try(x,y,z,r); cout＜＜r＜＜end1; return 0; void try(int x,int y, int z,int r) z = x+y; x = x*x; y = y*y; r = z+x+y;A．18B．9C．10D．不确定 查看答案
0.10，现对木板施加水平向右的拉力F=10N，为使木板能从物体下方被抽出，此拉力作用不得少于多少时间? 
