城建档案收集有利于维护()。
参考答案:国家机密
The little boy got rice to feed the chickens in the yard.
A.a piece of
B.a number of
C.a handful of
D.a loaf of
支原体肺炎属于
A.浆液性炎B.化脓性炎C.纤维素性炎D.间质性肺炎