皮皮学,免费搜题
登录
搜题
【简答题】
填写下列有工业价值的矿物的化学成分: (1) 萤石 _________________ (2) 生石膏 _________________ (3) 重晶石 ________________ (4) 天青石 _________________
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】The police think the fire was started ___________.
A.
affirm
B.
agony
C.
at ength
D.
glimpse
E.
on urpose
F.
presence
G.
radical
【多选题】页边距包括哪些?
A.
上边距
B.
下边距
C.
左边距
D.
右边距
【简答题】设η是欧氏空间中一单位向量,定义T(α)=α-2(η,α)η.证明: (1)T是正交变换,这样的正交变换称为镜面反射; (2)T是第二类的(即T对应的矩阵的行列式为-1); (3)如果n维欧氏空间中,正交变换T以1作为一个特征值,且属于特征值1的特征子空间V1的维数是n-1,则T是镜面反射.
【单选题】下列哪一个不属于质体( )
A.
白色体
B.
叶绿体
C.
有色体
D.
圆球体
【多选题】文档的页面设置是页边距包括哪些内容?
A.
B.
C.
D.
【单选题】下列哪组切牙舌面容易出现裂沟,好发龋坏?
A.
上颌中切牙
B.
下颌中切牙
C.
上颌侧切牙
D.
下颌侧切牙
【单选题】The police were delayed by the _________ of information about the crime.
A.
absent
B.
absence
C.
present
D.
presence
【单选题】The film star claimed that the police action was a(n) _____ on her private life.
A.
assure
B.
intrusion
C.
presence
D.
function
【单选题】通过微型计算机的电流大约为()A。
A.
1
B.
2
C.
2.5
D.
3
【简答题】Passage One Questions 46 to 50 are based on the following passage. Police officers may hope that their presence in schools will help them build strong relationships with students, improving police-com...
相关题目: