Propranolol is a A: M3 receptor agonist B: α receptor agonist C: β receptor antagonist D: α receptor antagonist E: NM receptor antagonist

Propranolol (普萘洛尔) belongs to A: α receptor antagonist B: α receptor agonist C: β receptor antagonist D: β receptor agonist

“Antagonist” refers to the main character in a drama.

“Antagonist”00a0refers to the main character in a drama.

What problems are the protagonist and the antagonist confronted with?

A drug combine with the receptors and show its effects, the drug is called A: partial agonist B: agonist C: noncompetitive antagonist D: competitive antagonist E: blocker

中国大学MOOC: The Conflict between a protagonist and an antagonist is a most common external conflict in literature.

‎A dynamic character may also be the antagonist, and a protagonist can also be, say, a flat and stock character.‌‎‌

A person who involves in the scientific study of people, society and culture is called __________. A: anthropologist B: antagonist C: socialist D: feminist

In terms of complexity, characters can be divided into ( ). A: static and dynamic characters B: flat and round characters C: protagonist and antagonist characters D: minor and major characters