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

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

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

The concentration or dose at which drugs produce equivalent effects is called A: efficacy B: potency C: excitation D: inhibition E: agonist

Tachycardia is more common observed in phentolamine than prazosin because the former A: has some M-agonist action B: has some β1-agonist action C: blocks postsynaptic α₂-receptors D: blocks presynaptic α₂-receptors E: stimulates heart directly

Propranolol is A: effective in the treatment of supraventricular arrhythmias B: effective in all angina pectoris cases by increasing the O2 supply C: lowers the blood pressure by reducing the renin synthesis D: cardioselective and having a partial agonist activity

以下不能将变量m清零的表达式是（ ）。: m=m&0/#/m=m&~m/#/m=m^m/#/m=m|m

<img src="http://edu-image.nosdn.127.net/6360CA697BBFE0086EF797FB70C5CF39.png?imageView&thumbnail=890x0&quality=100" />? ×、m、×、×、×、M|×、M、m、×、×、×|×、m、×、×、M、×|×、×、m、×、×、M

对于报文M若找到M’使_____，即找到碰撞能够构成对哈希函数H的攻击。（ ） A: M=M且H(M’)＝H(M) B: M’≠M且H(M’) ≠H(M) C: M’≠M但H(M’)＝H(M) D: M’=M但H(M’) ≠H(M)

若找到_____即找到碰撞能够构成对哈希的攻击（） A: M’=M且H(M’)＝H(M) B: M’≠M且H(M’) ≠H(M) C: M’≠M但H(M’)＝H(M) D: M’=M但H(M’) ≠H(M)