什么是喷水板？
参考答案：是一条长方形金属薄片，厚度0.8~1.5mm，宽度20~30mm，是水刺头形成高速水射流的核心零件。
-Where have you been today, Mary?
-I didn't go ______. I stayed at home the whole day.[ ]
A. somewhere
B. anywhere
C. nowhere
D. there
为什么衣服沾上少量的油渍可以用汽油去除？______．
