【简答题】a. ( ) (phr. v.) to make sure someone is behaving wellb. ( ) (v.) to believe someone is honest and reliablec. ( ) (adj.) responsible for doing something wrongd. ( ) (adj.) showing the ability to a...
【简答题】Barren adj. Unproductive, 贫瘠的 同:sterile The barren land could produce little food. 2. Intrigue N. Plot, scheme,阴谋 同:conspiracy v.引起...的兴趣 The king’s younger brother took part in the intrigue to make ...
【多选题】不属于鱼类皮肤表皮层的特征的是_____。
B.
表皮薄而柔软,角质化程度低,甚至一点也没有。
【简答题】adj.1. acceptable or allowed by law 2. fair or reasonable
【简答题】adj. reasonable and based on sensible thinking
【简答题】现有粗铜粉末,其中含有少量的铁、锌和金。某活动小组想要测定其中铜的质量分数,设计以下实验方案: 步骤Ⅰ:称取一定质量的粗铜样品,加入过量的稀盐酸充分反应,过滤,将滤渣洗涤、干燥后称量; 步骤Ⅱ:去“步骤Ⅰ”中所得滤渣在空气中充分灼烧,冷却到室温后称量; 步骤Ⅲ:根据测得数据推算出粗铜中铜的质量分数。 ⑴步骤Ⅰ:验证稀盐酸过量的方法是_________;如果不对滤渣进行洗涤而直接干燥,称量结果将会(...