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【单选题】
指挥错误(指挥失误、违章指挥等)属于( )危险源A.
物理性危险源
B.
化学性危险源
C.
生物性危险源
D.
心理、生理性危险源
E.
行为性危险源
F.
其他危险源
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反馈参考答案：
举一反三
【单选题】High concentrations of H2S gas are most dangerous to personnel because they can ______.
A.
cause involuntary muscle contractions
B.
paralyze your breathing system
C.
cause eye inflammation
D.
cause dizziness
【单选题】________ acts on the smooth muscle of the uterus and mammary glands, causing uterine contractions during labor and promoting milk release during lactation.
A.
Vasopressin
B.
Oxytocin
C.
Prostaglandin H 2
D.
Growth hormone
【单选题】What is mainly responsible for the delay between the atrial and ventricular contractions?
A.
the shallow slope of AV node pacemaker potentials
B.
slow action potential conduction velocity of AV node cells
C.
slow action potential conduction velocity along atrial muscle cell membranes
D.
slow action potential conduction in the Purkinje network of the ventricles
E.
greater parasympathetic nerve firing to the ventricles than to the atria
【判断题】Cardiac muscle cannot undergo summation of contractions because it has a very long refractory period.
A.
正确
B.
错误
【单选题】________ is a central nervous system disease which causes severe muscle contractions.
A.
Tetanus
B.
Ulcer
C.
Cataract
D.
Glaucoma
【简答题】Muscle contractions called hypnic myoclonia are often preceded by a sensation of starting to fall. (para.4)
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