在正常维护的条件下，结构应能在预计的使用年限内满足各项功能要求，也即应具有足够的()。
A.安全性
B.平稳性
C.适用性
D.耐久性
参考答案：D
It is reported that one of the rare animals, _____ crocodile, will be in danger of dying out
in _____ 2020s. [ ]
A. a; /
B. the; the
C. the; /
D. /; the
The shareholders can influence the board by various means.
