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用因果分析图可以找出事物的所有影响因素。( )
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What does the man mean
请根据下面和短文回答下面各题。 Some people say that they never have dreams. But that is not true. Everybody has dreams, but some people just have a better memory for them than others. Every one and a half hours in the whole night we enjoy our free time in our dreams. We can forget the good behaviour of the day and we are free to act in almost any way we like. Things from our past and things from now we come together. But as soon as we wake, the dream is gone, and the more we try to remember the things in the dream, the more we forget. "I had a dream last night. I must tell you about it. I was in my old school, but it wasn’t a school, it was a kind of a ... er ... I really don’t know what it was." So, why do we dream Are dreams important The experts tell us that they are important, because they can help us get ready for the problems of everyday life. The things in our dreams have meanings, they can help us to understand ourselves. What does "they" underlined in the last paragraph mean
借助于混凝土与预应力筋之间的粘结力来使混凝土产生在预压应力的预应力构件是采用先张法生产的。( )
千斤顶久置后，使用前应重新标定。( )
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