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【单选题】
病牛消化机能严重障碍，食欲减退，拒食，反刍停止，异嗜。粪便含有血液，呈松馏油样。直肠检查，手臂上黏附类似酱油色糊状物。有的出现贫血症状，呼吸急速，心率加快，伴发贫血性杂音，脉搏细弱。继发胃穿孔时，多伴发局限性或弥漫性腹膜炎，体温升高，腹壁紧张，后期体温下降，发生虚脱而死，该疾病是A.
皱胃溃疡
B.
瘤胃溃疡
C.
十二指肠溃疡 D．网胃溃疡 E．瓣胃溃疡
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举一反三
【单选题】During the cardiac cycle,
A.
the volume of blood leaving the left side of the heart is greater than that leaving the right side.
B.
the pressure of blood leaving the right side of the heart is greater than that leaving the left side.
C.
the duration of systole is greater than that of diastole.
D.
the duration of diastole is greater than that of systole.
【单选题】Which of the following occurs during ventricular systole
A.
decreased aortic pressure
B.
increased ventricular volume
C.
first heart sound
D.
P wave
【单选题】A 60-year-old man with a history of emphysema returns home from the hospital after suffering a myocardial infarction involving the apex of the left ventricle. Six months later, an echocardiogram revea...
A.
Calcific aortic stenosis
B.
Dilated cardiomyopathy
C.
Mitral valve prolapse
D.
Mural thrombus
E.
Ventricular rupture
【单选题】During the cardiac cycle of a human adult,
A.
ventricular filling depends mainly on atrial contraction
B.
the ventricle fills fastest during early diastole
C.
the atria and ventricles contract simultaneously during systole
D.
systole is initiated in the left atrium
【单选题】During the cardiac cycle,
A.
the duration of diastole is greater than that of systole.
B.
the volume of blood leaving the left side of the heart is greater than that leaving the right side.
C.
the pressure of blood leaving the right side of the heart is greater than that leaving the left side.
D.
the duration of systole is greater than that of diastole.
【单选题】During systole, the ventricles contract. this cause
A.
all valves to close.
B.
AV valves to close and semilunar valves to open
C.
AV valves to open and semilunar valves to close
D.
all valves to open.
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