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【简答题】
设 a , b , c 是空间中三条不同的直线,有下列命题: 1若 a ∥ b , b ∥ c ,则 a ∥ c ; 2若 a ⊥ b , b ⊥ c ,则 a ⊥ c ; 3若 a 与 b 相交, b 与 c 相交,则 a 与 c 相交; 4若 a ⊂ 平面 α , b ⊂ 平面 β ,则 a , b 一定是异面直线. 上述命题正确的是 ________( 写出所有正确命题的序号 ) .
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举一反三
【多选题】the five symbols of American culture
A.
the Statue of Liberty
B.
American Gothic
C.
Buffalo Nickel
D.
Uncle Sam
E.
Barbie DollsDolls
F.
MacDonalds
【多选题】Which one(s) are included in the most important national symbols of the USA?
A.
Coat of Arms of the United States
B.
The Bald Eagle
C.
The Flag of the United States
D.
The Maple Tree
E.
The Beaver
F.
The Maple Leaf
【简答题】A message is combined by the symbols 0, 1, 2 and 3. Assume that P{0}=1/3, P{1}=3/8, P{2}=1/8 and P{3}=1/6, it is obviously obtained that the self-information of the symbols 0 is ______________, the ...
【单选题】It consists of patterns, explicit and implicit, of and for behavior acquired and transmitted by symbols, constituting the distinctive achievement of human groups, including their embodiments in artifa...
A.
value
B.
culture
C.
steretype
D.
perception
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