The abnormality mitral stenosis was in myocardium, not in the valve.二尖瓣狭窄的病变是在心肌而不是在瓣膜.Valvular heart disease, usually aortic and mitral insufficiency, can complicate a variety of systemic diseases.瓣膜性心脏病, 以主动脉瓣及二尖瓣闭锁不全为...
短期内, 那些变异体就会在以后的爆发中起主导地位.In short order, those strains become dominant in the next outbreak.而一旦分离出变异体, 对应的突变基因就可以鉴定出来了.Once mutants have been isolated, the mutated gene can be molecularly identified.果胶是由半乳糖变异体和葡萄糖变异体角素构成...
Why does a space shuttle get hotter on reentry than on liftoff?能想象航天飞机穿越大气层时受到摩擦产生的热量有多惊人吗?来一起听听 吧 .Was it really hotter, or was he weaker?是天气比往年热呢, 还是自己的身体虚 呢 ?Hotter water was also better at removing dog dander and pol...