Platelets are important elements in the blood that are important for blood coagulation (clotting and prevention of bleeding). The normal platelet count ranges between 150,000 and 450,000 per microliter (one-millionth of a liter).
Known as Slauerhoffbrug (Slauerhoff Bridge), it is a tail bridge (kind of a bascule bridge) which can be quickly and efficiently raised by means of hydraulic mechanism to allow frequent passage of water traffic with minimum disruption to the vehicular traffic.uilt in 2000 the bridge is operated automatically almost every hour by two hydraulic cylinders which lift high in the air, a huge 15m by 15m portion of asphalt road. When closed the bridge deck merges seamlessly with the approach roads at both the ends.
In 1932, when the Sydney Harbour Bridge was opened, it was the longest single span steel arch bridge in the world. The main span is 503 meters (1,650 feet) across it consumed more than 52,800 tonnes of silicon based steel trusses.The plates of steel are held together by around 6 million steel rivets.he design was similar to New York's Hell Gate Bridge built 1916. The Hell Gate Bridge was a little shorter in span but was much lighter in construction as it only carried four railway tracks. Work first began on the Sydney Harbour Bridge in 1924, with construction of the bridge approaches and the approach spans.