题目：
Woman: Your dormitory room isn't very large, is it Man: I can hardly turn around in it. Question: What does the man mean
A．His room is quite small.
B．He had to walk around the dormitory.
C．It's hard to find a room in the dormitory.
D．It's his turn to look at the dormitory room.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：零阶保持器是将离散信号恢复到相应的连续信号的环节，它把采样时刻的采样值恒定不变地保持（或外推）到下一采样时刻。
