皮皮学，免费搜题
登录
搜题
【单选题】
能同时承受径向和轴向联合载荷,内外圈可分离的轴承是( )。A.
角接触球轴承
B.
深沟球轴承
C.
圆锥滚子轴承
D.
调心球轴承
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
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】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”).
相关题目：