对框架结构作抗震变形验算时，下列说法正确的是( )。

根据《水运工程混凝土试验规程》UTJ270-98）,在进行岩石抗压强度试验前,应将试件置于水中浸泡,水面应至少...

单项选择题根据《水运工程混凝土试验规程》UTJ270-98）,在进行岩石抗压强度试验前,应将试件置于水中浸泡,水面应至少高出试件顶面（ ）mm。

Magic（魔法）often forces us not to believe our own eyes or...

单项选择题Magic（魔法）often forces us not to believe our own eyes or even appears to be breaking laws of physics or nature! The word "magic" has many different meanings. When a bird appears in a hat or when someone declares that he could see into the future－both can be called magic. When a sick person suddenly becomes well or a well person (or even animal) becomes ill, magic is the cause. The British author Terry Pratchett uses magic a great deal in his popular Discworld series of books.
Magic has always been used for fun. People enjoy working out in which cup the little ball is or how he knows which card I was thinking of. Harry Houdini was one of the first world-famous magicians－famous for escaping from deadly situations. Recently David Copperfield, or David Blane, has become very popular for his "unbelievable abilities", such as making the Statue of Liberty disappear or rise.
Magical rings and three-headed dogs may not be real, but does this mean nothing magical really exists? Can you always explain how the magician has done the card trick? Maybe it is better not to explain, but to leave a little magic in our lives. Pick a card, any card…
Who is mentioned as a great escape artist?（　　

用未经焙烧的土坯、灰土和夯土作承重墙体的房屋及土窑洞、土拱房，只能用于( )。A.无抗震设防的地区B.抗震设...

单项选择题用未经焙烧的土坯、灰土和夯土作承重墙体的房屋及土窑洞、土拱房，只能用于( )。