皮皮学，免费搜题
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搜题
【单选题】
设命题公式A中中有3个命题变元,且A的主析取范式= m 2 ∨ m 3 ∨ m 5 ,则其主合取范式为A.
M 0 ∧ M 1 ∧ M 4 ∧ M 6 ∧ M 7
B.
M 1 ∧ M 4 ∧ M 6 ∧ M 7 ∧ M 8
C.
M 0 ∨ M 1 ∨ M 4 ∨ M 6 ∨ M 7
D.
M 1 ∨ M 4 ∨ M 6 ∨ M 7 ∨ M 8
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举一反三
【单选题】Both phentolamine and phenoxybenzamine
A.
are inactive by the oral route
B.
block both α and β receptors
C.
cause hypertension
D.
cause tachycardia
E.
induce vasospasm in large doses
【单选题】Phentolamine often causes an increase in heart rate and in the force of contraction by which of the following mechanisms:
A.
Directly stimulating cardiac ß 1 receptors
B.
Antagonizing the vagal transmitter
C.
Releasing histamine from mast cells, which stimulates the heart
D.
Blocking peripheral vasoconstriction, which produces reflex stimulation of the heart
【单选题】Both phentolamine and prazosin
A.
Are competitive antagonists at α1-adrenergic receptors
B.
Have potent direct vasodilator actions on vascular smooth muscle
C.
Enhance gastric acid secretion through a histamine-like effect
D.
Cause hypotension and bradycardia
E.
Are used chronically for the treatment of primary hypotension
【单选题】Phentolamine(酚妥拉明) belongs to
A.
α receptor antagonist
B.
α receptor agonist
C.
β receptor antagonist
D.
β receptor agonist
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