造成铸件浇铸不全的原因有哪些?
能经Fc段与肥大细胞和嗜碱性粒细胞表面FcεR结合的Ig是() ["A．IgG","B．IgA","C．IgM","D．IgD","E．IgE"]
防止冷隔应采取哪些措施?
正常人血清中含量最低的Ig是() ["A．IgG","B．IgA","C．IgM","D．IgD","E．IgE"]
SIgA由几个单体组成() ["A．一个","B．两个","C．三个","D．四个","E．五个"]
在对义齿进行抛光时，为防止因摩擦产热而烧焦塑料或导致基托变形，应采用哪些措施?
