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【单选题】
A cell that can differentiate into all cell types of the adult organism is known as ( ). Such cells are called meristematic cells in higher plants and embryonic stem cells in animals.A.
multipotent
B.
totipotent
C.
pluripotent
D.
unipotent
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举一反三
【多选题】按照《全国统一建筑工程预算工程量计算规则》的规定，建筑施工土方开挖需要放坡的起点深度是指( )的深度。
A.
从室外地坪至垫层底面
B.
从室外地坪至垫层顶面
C.
从室外地坪至基础底面
D.
从室内地坪至垫层底面
E.
从自然地坪至基槽底面
【简答题】My mom is a teacher．She finds a lesson in everything．I was watching Sesame Street by my second birthday so I’d 16 my ABCs and 123s．Our weekly family trips to the library began when I was three．And...
【单选题】谓词公式 x(P(x)∨ yR(y))→Q(x)中量词 x的辖域是( )。
A.
x(P(x)∨ yR(y))
B.
P(x)
C.
(P(x)∨ yR(y))
D.
P(x),Q(x)
【单选题】谓词公式 x(P(x)∨ yR(y)) Q(x)中量词 x的辖域是( )。
A.
P(x)∨ yR(y)
B.
P(x)
C.
(P(x)∨ yR(y)) Q(x)
D.
Q(x)
【单选题】谓词公式 x(P(x)∨ƎyR(y))→Q(x)中量词x的作用域是( )。
A.
P(x)
B.
(P(x)∨ƎyR(y))
C.
P(x),Q(x)
D.
(P(x)∨ƎyR(y))→Q(x)
【简答题】When most of us get a text message on our cell phone from an unknown person, we usually say “sorry, ______ number!” and move on. But when Dennis Williams ______ a text that clearly wasn’t intended for...
【单选题】谓词公式 x(P(x)∨ yR(y)) Q(x)中量词 x的作用域是( )。
A.
x(P(x)∨ yR(y))
B.
P(x)
C.
(P(x)∨ yR(y))
D.
P(x)，Q(x)
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