明明做了8道口算题,错了1道,正确率应该是______%.
正确率=8-18×100%,
=0.875×100%,
=87.5%.
答:正确率应该是87.5%.
故答案为:87.5.
人体心室在最适前负荷时,心室充盈压力为 ( )
A.0.67~0.80kPa(5~6mmHg)
B.0.93~1.47kPa(7~11mmHg)
C.1.60~2.00kPa(12~15mmHg)
D.2.13~2.67kPa(16~20mmHg)
E.>2.67kPa(16~20mmHg)
低碳钢的室温组织为珠光体加渗碳体。( )