速度v、长度l、时间t的无量纲集合是（）。
A.A
B.B
C.C
D.D
参考答案：D
She likes pets. She has three dogs. _____, she has a cute cat. [ ]
A. But
B. Except
C. Beside
D. Besides
工作环境包括施工的温度、湿度、天气、环境污染及工序衔接对抹灰工程质量有重大影响。( )
