【单选题】“Drive my dead thoughts over the universe Like withered leaves to quicken a new birth.” What rhetorical device does the poet use in the quoted lines?
【简答题】FeS、CuS和ZnS等硫化物,有的溶于盐酸,有的则不溶,这主要是因为它们______。
【单选题】I always drive _____ to work.
【单选题】My mother likes _____________ a bus. [ ]
【简答题】利用拉普拉斯变换的性质,求下列函数的拉普拉斯变换:f(t)=te -2t