局部脑血流断层显像可用于脑梗死的诊断。一旦脑梗死发生，在影像上即可显示病变部位放射性明显增加，阳性率近100%。
参考答案：错
Water makes up some 70 percentage points of the body, and drinking enough water—either tap water or expensive mineral water—will ensure that the body is properly lubricated and flushed.
A．per-cent
B．per capita
C．percent
D．percentage
要道还道的方法是怎样规定的？
