These thumps are replaced by thrills when valvular insufficiencies or stenoses or congenital defects are present.这些撞击在瓣膜闭锁不全或狭窄,或者有先天性缺损时被震颤所代替.Valvular heart disease, usually aortic and mitral insufficiency, can complic...
一天早晨, 彼得的爸爸带着彼得去看金门桥.One morning, Peter's father took Peter to the Golden Gate bridge.可是,这条通道为什么叫做‘金门’ 呢 ?”But why is the opening called the Golden Gate?金门桥面一定该是金色的 吗 ?Will the Golden Gate Bridge ever be golden?...
Regular vinyl addition polymers may be obtained from particularly strained endocyclic double bonds.由带特殊张力的桥环双键可以得到规整的乙烯类加成聚合物.Use vinyl seam adhesive where vinyls overlap.塑料布相叠处用塑料封口胶粘起来。This compilation was first issued...