Pictures of starving children have sent many people scurrying to donate money.看到一张张忍饥挨饿的孩子们的照片，许多人赶忙捐钱。This led Zagreb's twin town, Mainz, to donate £70,000-worth of high-quality equipment.这使得萨格勒布的友好城市美因茨捐赠了价值7万英镑的高...
Alkanes are resistant to attack by oxidizing agents generally.烷烃一般对于氧化剂的作用是稳定的.The general uses of alkanes may be divided into three categories.烷的一般用途可分为三个方面.The straight - chain alkanes exacerbate the problem of engine ...