皮皮学，免费搜题
登录
搜题
【单选题】
下列命题中,不正确的是A.
空间 V 中保持个向量的距离不变的线性变换必为正交变换。
B.
空间 V 中把某一标准正交基变为标准正交基的线性变换为正交变换。
C.
空间 V 中保持向量的夹角不变的线性变换必为正交变换。
D.
空间 V 中何持内积不变的线性变换必为正交变换。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】The twins usually leave _____ home _____ school very early. [ ]
A.
to, for
B.
for, to
C.
from, to
D.
/, for
【单选题】The twins usually stand ____their parents ,and their parents are in the middle .
A.
beside
B.
to
C.
on
D.
next
【单选题】The twins usually_____milkandbreadforbreakfast,but Jim_____somecoffeeforit.
A.
have/have
B.
have/has
C.
has/have
D.
/
【单选题】The writer wants to impress you that______.
A.
American people are more busy than people in the other countries
B.
American people are more friendly than they appear
C.
American people are mostly moving at fast pace but they are also ready to help those in need
D.
American people like to help foreigners
【多选题】what are the two suggested models for giving a comment as an attention getter for LO?
A.
statistic model
B.
problem claiming model
C.
quotation model
D.
assumption model
【单选题】People have realized that resources are wasted if goods_________.
A.
are not of lasting value
B.
are not sold at a high price
C.
remain unsold for a long time
D.
remained unsold in export markets
【判断题】口腔颌面部X线检查不仅包括牙齿、牙周组织及上下颌骨的检查,还包括颅、面、颈部其他组织结构的检查,如头颅、颅底、颞下颌关节、颜面软组织、唾液腺及颈部等
A.
正确
B.
错误
【单选题】We have P.E lessons _____. [ ]
A.
every two days
B.
each two days
C.
every two day
D.
each two day
【单选题】The twins usually milk and bread for breakfast, but Jim only some coffee for it.
A.
have; have
B.
have; has
C.
has; have
D.
has; has
相关题目：
参考解析：
知识点：
题目纠错 0
发布
