超声波探伤系统所具有的探测最小缺陷的能力,称为仪器的()。
参考答案:探伤灵敏度
正常二尖瓣口面积()。
A.<1.0cm2
B.1.0~1.5cm2
C.1.5~2.0cm2
D.2.0~4.0cm2
E.4.0~6.0cm2
____ many countries in Latin America have been trying to reduce gaps in income,
America has allowed inequality to grow. [ ]
A. While
B. Since
C. If
D. So