现有CO、CO2、O3(臭氧)三种气体,它们分别都含有1mol氧原子,则三种气体的物质的量之比为( )
A.1:1:1
B.1:2:3
C.3:2:1
D.6:3:2
答案:D
All the fellow workers were shocked by news that Bob was appointed director of the factory.
A.a; the
B.the; /
C.the; the
D./; /
220V架空线路一般段初步设计线路路径方案图视线路长度情况可按1:100万、1:50万、1:25万、1:5万等,推荐路径方案图一般按()比例。
A.1:100万
B.1:50万
C.1:25万
D.1:5万