Well we need to put by £200 for the pump valves to be renewed.我们需要存下200英镑以备更换水泵阀。The heart has valves to let blood flow in and out of it.心脏有瓣膜控制血液流进流出.The engineering gang fell earnestly to work on jammed valves.轮机组都起劲地埋...
A compound of hydrogen with another, more electropositive element or group.由硅和另一种阳性更强的元素或基组成的化合物.Is electropositive second liver big how are 3 this world treated?阳性乙肝大三阳怎么治疗?A compound of phosphorus and a more electropos...