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【单选题】
以下说法中错误的是( )。A.
金属材料的强度越向,抵抗变形和断裂的能力越强
B.
拉伸强度实验中,当拉伸力达到屈服点后保持不变时,试样仍能继实伸长
C.
常见金属材料判断塑性的指标为伸长率与断面收缩率
D.
加I零件的表面粗精度值越高,则披劳强度越大
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举一反三
【单选题】It can be inferred from Paragraph Five that the best funding comes from______.
A.
finance from governments
B.
company's sponsor
C.
organizations themselves
D.
national libraries
【单选题】From where could boys and girls learn about sexual problems in America?
A.
From parents.
B.
From PE classes.
C.
From health classes.
D.
All of the above.
【简答题】If people undergo______from their emotions, thoughts or behavior, they may be suffering from mental disease.
【多选题】Coal mining accidents include _____.
A.
gas explosion
B.
coal-dust explosion
C.
carbon dioxide releasing
D.
mine flood
E.
mine fire hazard
F.
roof accidents
【单选题】The following are the reasons why British coal mining is today called a"sick"industry except（）
A.
Britain has used up almost all coal deposits
B.
the demand for British coal has declined
C.
petroleum,water power,and electric power are replacing coal for many purposes
D.
the old British mines are narrow and deep,making it difficult to sue machines fro mining.
【简答题】什么是数据？什么是数据库？
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