在锚喷混凝土加同基坑的施工中，混凝土采用的碎（砾）石最大粒径不宜大于（）mm。A．1

家用消毒柜常用臭氧（O₃）消毒，在消毒过程中通过放电发生如下反应：3O₂(g)=2O₃(g)△H=+144.8kJ/mol；下列关于臭氧说法不正确的是

A．O₂和O₃互为同素异形体

B．O₃具有较强的氧化性

C．O₂比O₃稳定

D．植物油等食物为防止细菌污染，可放入消毒柜中消毒

若用内含报酬率法评价某投资方案，判定该投资方案可行的标准是内含报酬率( )。

A．大于零

B．大于企业的资金成本

C．大于1

D．小于企业要求的最低报酬率

E．大于企业要求的最低报酬率

Directions: Complete the following passage by filling in each blank with one word that best fits the context.

Our school is quite famous for its long history. It was founded in the early 1907s. It is a good place   1  we can prepare ourselves well for the future. We have many wonderful teachers   2  are always ready to offer help.  3   we pay a lot of attention to how well we do in lessons, achieving high scores is not the only reason to study. The teachers encourage us to try   4 new ideas and ask questions. With their help we have developed all kinds of interests  5 both Arts and Science. We can choose to join any school clubs they are interested in. We can  6 choose the subjects that we want to study. Last term I selected American literature   7 I wanted to learn about famous American writers. This term I chose to attend music classes because my father bought me a piano as   8  birthday present.

急性肾炎的病因绝大多数与下列哪种微生物感染有关（）

A.乙肝病毒

B.巨细胞病毒

C.β-溶血性链球菌

D.沙眼衣原体

E.葡萄球菌

运行中的柴油机，检查发现活塞环局部发黑，表示（）。

A.与缸套磨擦严重

B.与缸套未接触

C.粘上了缸套磨屑