大漆涂饰施工周期较长，还受到温度和（）的限制.
A.湿度
B.环境
C.基层
D.无限制
参考答案：A
If x, y, and z are positive integers and x2=y2+z2, which of the following must be true ？（） Ⅰ.x＞z Ⅱ.x=y+z Ⅲ. y2+z2 is a positive integer
A. Ⅰ only
B. Ⅱ only
C. Ⅲ only
D. Ⅰ and Ⅱ only
E. Ⅰ and Ⅲ only
