对渣油气化反应结果,原料气中H2浓度随着反应温度升高而()。
A、升高
B、降低
C、先降后增
D、先增后降
参考答案:D
89. Was this piece of earthenware(陶器) made machine or _____ hand?
A.by; by
B.with; by
C.with; with
D.by; with
东堤上建有目前我国园林中最大的博物馆,它的名称是什么?哪年建成开放的?