He was convinced that doctors and dentists knew best.他确信医生和牙医最清楚该怎么做。Children often fight shy of dentists.孩子们常常害怕看牙医.These figures are arrived at on the basis of dentists' receipts for 1991-1992.这些数字是根据1991至1992年间的牙...
Lithium has some chemical behavior that resembles the chemistry of Mg.锂的某些化学行为类似于Mg的.Obviously the force of gravity Mg is acting vertically downward.显然重力的Mg作用垂直向下.More diphenylthiocarbazone should be used to estimate bar...