Study on effects of ultrasound on inhibiting scale formation and its mec hanism .

超声波抑制积垢的影响因素与机理的研究。

Laranja mec nica is a great example of how to properly use only two classic colors black and white in order to force the product to jump off the retail shelves .

柳橙切片机是一个很好的例子，告诉我们怎样正确使用黑色和白色这两个经典的颜色，为的是把产品从零售货架上吸引下来。