It is necessary to do 的例句

it is necessary to的例句：
It is necessary to keep the offices neat .
有必要保持办公室的整洁.
I it is necessary to learn a foreign language .
我认为学习一门外语是必要的.
In this situation it is necessary to rank the projects .
在这种情况下,有必要对有关项目分等排列.
It is necessary to maintain surveillance on these meters .
必须对这些仪表保持经常性的监测.
For proper combustion it is necessary to atomize the propellants .
为了有效地进行燃烧,推进剂必须雾化.
It is necessary to accept a substantial degree of state intervention .
接受极大程度的国家干预是完全必要的.
I find it sad that couples it is necessary to sign such documents.
我认为这对夫妇觉得有必要签署这样一份约定的想法是可悲的.
It is necessary to weigh the answers in accordance with the general veracity of the owner .
需要根据所有者的一般诚实程度来衡量其回答.