【单选题】A gas undergoes the cyclic process represented by the pressure (P) vs. volume (V) diagram above. During which portion of this process is no work done on or by the gas?【图片】
A.
AB
B.
BC
C.
CA
D.
Some work is done on or by the gas in each of the three steps
【单选题】An autopsy is performed on a man who died of an unknown cause. The pathologist discovers that the man has a small atrial septal defect. The defect is seen in the portion of the atrial septum near the ...
A.
No cyanosis occurred prenatally or postnatally
B.
Postnatal cyanosis due to a shunt of blood from the left atrium to the right atrium
C.
Postnatal cyanosis due to a shunt of blood from the right atrium to the left atrium
D.
Prestnatal cyanosis due to a shunt of blood from the right atrium to the left atrium