在花粉形成过程中,花药内天然产生一种化合物.During pollen formation a compound is produced naturally in the anther.将花药筛到无光的 、 具渗透性的纸上, 如报纸或卫生纸, 以便花药干燥.Sift the anthers onto unglazed, permeable paper, such as newspaper or paper toweling, for d...
高介电常数具有氢键液体的特征.The high dielectric constant is characteristic of hydrogenbonded liquids.副介指向空间的确定位置.The secondary valence is directed toward fixed positions in space.卤原子在它们的介电子层含有七个电子.Halogen atoms contain seven electron...
通用柴油动力火车头将车厢转轨到了4号月台。The GM diesel engine shunted the coaches to Platform 4.他坐在一节二等车厢的角落里。He sat in the corner of a second-class carriage.当火车驶进巴斯尔登站时，一节车厢的门撞到他了。A carriage door struck him as a train drew into Basildon st...