(1) There are 30 birds at the pet shop. (2) There are 20 more dogs than birds at the pet shop. OPEN DISCUSSION F THIS QUESTION IS HERE: at-a-certain-pet-shop-1-3-of-the-pets-are-dogs-and-1-5-of-97391.html.[Reveal] Spoiler: OA. D. Last edited by Bunuel on Mon Nov 25, 2013 2:46 am, edited 1 time in total.e: At a certain pet shop, 1/3 of the pets are dogs and 1/5 of t [#permalink] Mon Nov 25, 2013 2:48 am. Expert's post. At a certain pet shop, 1/3 of the pets are dogs and 1/5 of the pets are birds.
Frits are important components of most ceramic glazes. A frit is a type of ceramic glass that predominantly consists of silica, diboron trioxide, and soda. This combination of raw materials are industrially melted and rapidly cooled, making them insoluble.
FR-4, is a widely acceptable international grade desination for fiberglass reinforced epoxy laminated that are flame retardant (self extinguishing). After add copper layer on one or each side FR4, it become to Copper Clad Laminate (CCL), and this is the non-conductive core materail for normal printed cricuit board (PCB). Printed circuit board using FR4 as core material will be named as FR4 PCB.