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【单选题】
三视图的投影规律是主左视图,主俯视图长对正,( B )。A.
主右视图
B.
俯左视图宽相等
C.
俯仰视图长对正
D.
主后视图宽相等
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皮皮学刷刷变学霸
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】听力原文： The fiddler crab is a living clock. It indicates the time of the day by the color of its skin, which is dark by day and pale by night. The crab's changing skin color follows a regular twenty-fou...
A.
Why they change color.
B.
Whether they change color.
C.
How to use them as clocks.
D.
Where they can be caught.
【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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