点P(1,2)到直线4x+3y-1=0的距离为______.
点P(1,2)到直线4x+3y-1=0的距离d=|4×1+3×2-1|42+32=95.
故答案为95.
句型转换。
1. He thinks he can play the erhu. (改为否定句)
2. She often wears pants and a sweater in fall. (对画线部分提问)
3. I go to Shanghai. (改为将来时的句子)
4. Are mitts and mittens the same? (作答)
5. I would like some Chinese food. (对画线部分提问)
患者,女,11岁。替牙,上牙前突,有间隙,前牙深覆,下颌明显后缩,面下1/3短。
诊断:安氏Ⅱ类1分类。矫治器设计为功能性(FR-1)矫治器,导下颌向前。
FR-1型功能调节器适用于矫治的牙畸形是()
A.安氏Ⅱ类1分类
B.安氏Ⅱ类2分类
C.安氏Ⅲ类
D.安氏Ⅳ类
E.开