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【单选题】
烤炉是电源或气源产生的热能,通过炉内的空气和( )和金属传递热,使制品成熟。A.
金属
B.
氧气
C.
二氧化碳
D.
氦气
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反馈参考答案：
举一反三
【简答题】Write formulas:
【简答题】To the formulas for the circle(圆) correspond the following formulas for the hyperbola(双曲线).
【单选题】Traditional math regards constructivist maths curriculum as memorizing simple formulas.
A.
Y
B.
N
C.
NG
【单选题】In addition to writing your own formulas, you can use predefined formulas called ____.
A.
values
B.
functions
C.
labels
D.
calculations
【单选题】if p、q and r are Boolean variables, which of the following formulas is (are) autological? ( ) Ⅰ. (┐P→q)→(p∨q) Ⅱ. (p→r)∧(┐p→q) ∧┐r
A.
none
B.
Ⅰ only
C.
Ⅱ only
D.
Ⅰ and Ⅱ
【单选题】The formulas of oxoacids are derived from _____
A.
the corresponding oxocations by adding enough hydrogen ions.
B.
the corresponding oxoanions by adding enough negative charges.
C.
the corresponding oxoanions by adding enough hydrogen ions.
D.
the corresponding oxocations by adding enough negative charges
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