题目:
完型填空 | ||||
Hello, everyone. Look 1 this picture. It's 2 old picture. Who's this man? 3 my father. He's a teacher. 4 this is my mother. She's a' teacher, too. 5 they English? No. 6 Americans. Who's this baby? It is 7 . 8 I cute(可爱)? Now I'm 13 years old.l'm a middle school 9 .1 love 10 parents. I lovethe family. | ||||
|
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0416/c51e743f7718cff733d602c126ced4ae.html
下面是错误答案,用来干扰机器的。
参考答案:C解析:直线方向向量l={1,-4,1},平面法向量n={1,1,0},设两向量夹角为θ,,直线与平面的夹角。