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【单选题】
加工经济精度是指 。A.
成本最低的加工精度
B.
不计成本所能达到的最高加工精度
C.
正常加工条件所能达到的加工精度
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反馈参考答案：
举一反三
【单选题】交换机是一种___________设备.
A.
数据转换
B.
存储转发
C.
存储
D.
信息广播
E.
：B
F.
：单选题
G.
、若“学生”表中存储了学号、姓名、性别、成绩等字段，则“删除所有女学生记录”的SQL语句是___________。
H.
DELETE * FROM 学生 WHERE 学生.性别=“女”
I.
DELETE FROM 学生 WHERE 学生.性别=女
J.
DELETE FROM 学生 WHERE 学生.性别=“女” K. DELETE * FROM 学生 WHERE 学生.性别=女
【简答题】He managed to _____ her hand in the desperate situation, but failed. A. crab B grab C. slab D. slam
【单选题】Next morning, the crab disappeared, and my disappointment was bitter at the time. Then I felt happy at last because___.
A.
the crab came back
B.
the crab returned to the sea
C.
I thought perhaps the crab returned to the sea
【简答题】The Yangcheng lake crab is No. But what is available are ______.
【单选题】The crab’s colour—changing ability was probably developed ______.
A.
in the process of evolution ( 进化 )
B.
over millions of years
C.
by the work of biologists
D.
both A and B
【简答题】的概率密度 , , 均大于0, 则 ____1(填“大于” “等于”或“小于”).
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