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【单选题】
关于轴测投影的特点说法错误的是()A.
直线的分段比例在轴测投影中比例仍不变
B.
凡相互平行的直线其轴测投影仍平行
C.
形体上与三个坐标轴平行的直线尺寸，在轴测图中均可沿轴向量取
D.
与坐标轴不平行的直线，其投影可能变长
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举一反三
【单选题】The record of the past half century has established, I think, the two general principles about human disease. First, it is necessary to know a great deal about underlying mechanisms before one can rea...
A.
Scientific appraisal shows that multifactorial diseases are often due in part to environmental conditions.
B.
In the past half century, scientists have been able to find only a few principles that apply to all diseases.
C.
Each disease has single underlying mechanism that must be understood before the disease can be cured.
D.
Many diseases that were once life-threatening can now be cured by antibiotics.
【多选题】Which two security mechanisms can be directed through a sub-element of the element in a web application deployment descriptor？（）
A.
Authorization
B.
Data integrity
C.
Confidentiality
D.
Authentication
【简答题】公差等级的选择原则是 前提下,尽量选用 的公差等级。
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