PYLL
参考答案：潜在减寿年数：是某病某年龄组人群死亡者的期望寿命与实际死亡年龄之差的总和，是指死亡所造成的寿命损失。
In C language, the result of the logical ______ operator is 1 if the value of its operand is 0, 0 if the value of its operand is non-zero.
A．AND
B．NOT
C．OR
D．EOR
