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【判断题】
氧化锆式氧传感器产生的电压在理论空燃比附近时电压信号发生跃变。A.
正确
B.
错误
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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】Mary just purchased a bond which pays $60 a year in interest. What is this $60 called?
A.
coupon
B.
face value
C.
discount
D.
call premium
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