elementary 四级六级考研

His classmates were labouring with elementary algebra.

他的同学们正在绞尽脑汁地演算代数题。

Most children go to public elementary and secondary schools.

大多数孩子上的是公立小学和公立中学。

Their course of study includes elementary hygiene and medical theory.

他们的课程包括基础卫生学和医疗知识。

I always use my clients' products. This is not toadyism but elementary good manners.

我总是客户的产品。这并不是谄媚奉承，而是良好的基本态度。

Let G be an infinite group. If G has a normal elementary abelian subgroup, then G is irrecognizable.

设G是无限群,若G存在正规交子群,则G是不可分辨的.

Nonnatural amino acid 3-(4-thiazolyl)-D,L-alanine hydrochloride and its four intermediates were synthesized, their structures were detenmined by IR,NMR,elementary analysis and melting point.

合成了非天然氨基酸3-(4-噻唑基)-D，L-丙氨酸盐酸盐以及三个中间体，其结构分别通过红外光谱、核磁共振、元素分析、熔测试手段得到确证。