湿邪致病，病程长，缠绵难愈，其原因是（）
A.湿为阴邪，阻遏气机
B.湿邪伤阳
C.湿性黏滞
D.湿性重浊
E.湿性趋下
参考答案：C
根据课文内容填空
Li Hua plays football every day. In his _____小题1:_____ time, he studies English. He also enjoys _____小题2:_____ to music. It makes him _____小题3:______.
与切线支距法比较，偏角法详细测设曲线的优点是（）。
A.适用于任何地区
B.误差不积累
C.易于发现错误
D.测设精度高
