Please keep the door _______, it's very cold. [ ]
A. open
B. opens
C. close
D. closed
答案:D
“返工”与“返修”的区别
地下水统测站基本情况一览表中“井深”栏,分原来和现在,前者指上次或某特定次观测时,后者指当次或某特定次观测时,两者之差为()。
A、高程差
B、淤积厚度
C、水位差
D、落差