Properly designed heat exchangers substantially improve the contacting in the bed by breaking up growing bubbles.合理设计的热交换器能使长大的气泡破碎,以有效地改善床层中的接触.He couldn't imagine why he had let so much time pass without contactin...
Use different colours of felt pen on your sketch to avoid confusion.用不同颜色的毡头笔画草图，以免搞混。Light colours provide an effective backdrop for pictures or a mirror.浅色是挂放图画或镜子很有效果的衬托。A wide range of colours and patterns are availa...