测量土层的剪切波速应满足划分建筑场地类别的要求，下列哪一选项是错误的( )
A．计算土层等效剪切波速和确定场地覆盖层厚度都与场地的实测剪切波速有关
B．若场地的坚硬岩石裸露地表可不进行剪切波速的测量
C．已知场地的覆盖层厚度大于20m并小于50m，土层剪切波速的最大测量深度达到 20m即可
D．已知场地的覆盖层厚度大于50m并小于80m，土层剪切波速的最大测量深度达到 50m即可
参考答案：D
| 阅读理解。 |
| "Time is a problem for children," says a news report for a new Swiss watch. Children in some countries "learn time slowly" because "they don't wear watches" and "parents don't really know how to teach them time." The children grow up with this handicap and become adults and then can't get to work on time. Is there an answer to this problem? Of course it's the Flik Flak, made by a famous Swiss watch company. The Flik Flak is being marketed as something teaching watch for children aged 4 to 10. The watch itself does not teach children how to tell time, of course; it only "takes their imagination" by presenting the "hour" hand as a beautiful red girl named Flak and the "minute" hand as a tall blue boy named Flik. Flik points to "blue" minutes on the dial (钟面), while Flak points to "red" hour numbers. The characters and colors together with parental help, are supposed to teach young children how to tell time. Peter Lipkin, the United States sales manager for the Flik Flak, calls it "childproof: if it gets dirty you can throw the whole watch in the washing machine," The product is being sold in some department stores in Europe, Asia and the United Stares for a suggested price of $25. Parents who buy the watch may find that it is odd thing to tell time; it's quite another for them to be on time. |
| 1．From the news report we know that _______. |
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| A．parents are patient when they are teaching children time B．parents have little idea of how to teach children time C．children in every country learn time slowly D．children enjoy wearing the Flik Flak watch |
| 2．The underlined word "handicap" in the first paragraph means _______. |
[ ] |
| A．优势 B．特点 C．失望 D．不足 |
| 3．The United State sales manager calls the new watch "childproof" because _______. |
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| A．it is designed to teach children to be on time B．it proves to be useful in teaching children time C．it is made so as not to be easily broken by children D．it is the children's favorite watch |