There are four valves in the heart and each one has strong flaps called “leaflets” that control blood flow. Leaflets open to let blood move through the heart and out to the rest of the body. They then ...
BUTTERWORTH: The leaking control valve at the Sungai Dua Water Treatment Plant (WTP) has been successfully replaced, says Chief Minister Chow Kon Yeow "A leaking valve was successfully replaced ...
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