double overhead crankshaft engine是什么意思

用法例句

The geological feature of Shuangding mineral estate of Linglong gold field and its regularity of gold enrichment;

玲珑金矿田双顶矿段地质特征及金的富集规律

Methods The thickness of the soft tissue of humerus head,biparietal diameter (BPD),femur length (,humerus length (HL) in 478 normal pregnant women (gestational time:38～40 weeks) were measured by B-US.

方法选择妊娠38~40周正常妊娠妇女478例,产前经腹超声测量胎儿肱骨头皮下软组织厚度、双顶径、股骨长、肱骨长,分析其与新生儿出生体重的相关性。

The circle of head outline is automatically obtained by hough transform, and its diameter is approximately equal to the biparietal diameter.

利用hough变换自动逼近,获得最逼近胎儿大脑轮廓的圆周,此圆周的直径可以近似双顶径。