helical的例句（helical在句子中的用法）

• Methods: The root canalroot canal orifice burs and helical drilling bits were prepared in advance. 方法: 采用根管口台阶状车针与螺旋型根管钻组合起来扩大根管.
• Objective To study the diagnosis value of helical CT singlet hilum of lung and mediastinal lymphadenectasis. 目的探讨螺旋CT对单纯肺门纵隔淋巴结肿大的表现及诊断.
• The high laevorotation of L - cystine depends on a specially helical structure of its molecular. 指出了L - 胱氨酸高度的左旋性是由其分子的特殊螺旋结构决定的.
• Two types of viral symmetry have been recognized, the cubical symmetry and helical symmetry. 已经证实病毒有两种对称型, 即立体对称和螺旋对称.
• In a globular protein, certain portions of the chain are coiled into helical segments. 在球状蛋白中, 链的某些部分被盘成螺旋状.
• The polynucleotide chain is helical. 多核苷酸键是螺旋形的.