液压电梯当柱塞通过其行程限位装置而到达其上限位置时，轿厢上方应当有足够空间能够容纳一个不小于（）的长方体。
参考答案：0.5×0.6×0.8m
--- Excuse me, have you seen _______ umbrella here?
--- Yes. Is it _______ beautiful blue one? I saw it here just now.
A．an, the
B．an, a
C．the, the
D．the, a
