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【单选题】
Edward Wilson is America s, if not the world s, leading naturalist. In The Future of Life, he takes us on a tour of the world s natural resources(资源). How are they used? What has been lost ?What remains and is it able to continue with the present speed of use? Wilson also points out the need to understand fully the biodiversity(生物多样性) of our earth. Wilson begins with an open letter to the pioneer in environment (环境)protection, Henry David Thoreau. He compares today s Walden Pond with that of Thoreau s day. Wilson will use such comparisons for the rest of the book. The problem is clear: man has done great damage to his home over the years. Van the earth, with human help, be made to return to biodiversity levels that will be able to support us in the future? Biodiversity, Wilson argues, is the key to settling many problems the earth faces today. Even our agricultural crops can gain advantages from it. A mere hundred species(物种)are the basis of our food supply, of which but twenty carry the load. Wilson suggests changing this situation by looking into ten thousand species that could be made use of, which will be a way to reduce the clearing of the natural homes of plants and animals to enlarge farming areas. At the end of the book, Wilson discusses the importance of human values in considering the environment. If you are to continue to live on the earth, you may well read and act on the ideas in this book. We learn from the text that Wilson cares most about.
A.
the environment for plants
B.
the biodiversity of our earth
C.
the wastes of natural resources
D.
the importance of human values
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【判断题】Excel中公式的移动和复制是有区别的,移动时公式中单元格引用将保持不变,复制时公式的引用会自动调整。
A.
正确
B.
错误
【单选题】一对减速齿轮传动中,若保持分度圆直径不变,而减少齿数并增大模数,其齿面接触应力将_____。
A.
增大
B.
减小
C.
保持不变
D.
略有减小
【单选题】一对减速齿轮传动中,若保持分度圆直径不变,而减少齿数并增大模数,其齿面接触应力将 ( )。
A.
增大
B.
保持不变
C.
减小
D.
略有减小
【判断题】Excel中公式的移动和复制是有区别的,移动时公式中单元格引用交将保持不变,复制时公式的引用会自动调整。
A.
正确
B.
错误
【判断题】一对减速齿轮传动中,若保持分度圆直径d1不变,而减少齿数和增大模数,其齿面接触应力将保持不变。( )
A.
正确
B.
错误
【单选题】以下关于字段的叙述中,错误的是
A.
可以为任意类型的字段设置默认值属性
B.
不同的字段类型的字段属性有所不同
C.
在数据表视图中不能直接编辑计算类型字段
D.
有效性规则是表达式,可用于限制字段的输入
【单选题】以下关于字段的叙述中,错误的是
A.
可以为任意类型的字段设置默认值属性
B.
不同的字段类型的字段属性有所不同
C.
有效性规则是表达式,可用于限制字段的输入
D.
在数据表视图中不能直接编辑计算类型字段
【单选题】I could not persuade him to accept it,______ make him see the importance of it.
A.
if only I could not
B.
no more than I could
C.
or I could not
D.
nor could I
【简答题】I could not persuade him to accept it, _____________ make him see the importance of it. [A] if only I could not [B] no more than I could [C] or I could not [D] nor could I
【单选题】一对减速齿轮传动中,若保持分度圆直径不变,而减少齿数和增大模数,其齿面接触应力将()。
A.
增大
B.
减少
C.
不变
D.
略有增加
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