检修仪器所用的清洁液用后要及时盖紧,所用的辅助材料(如垫片、压片等)要经防霉、防雾处理。检修后的仪器应进行检校。( )
参考答案:对
How much is your ruler? [ ]
A. I have a new ruler.
B. It's under the book.
C. It's seven yuan.
大麦酊犬被毛上的斑点以哪些为佳?()
A、黑斑与蓝斑
B、黑斑与红褐斑
C、蓝斑与红褐斑
D、红色与棕色