The letters adapt and get selected for their suitability to English; rarely is there an attack of the "Q" or "Z" letters.
字母的适应和选择取决它们对英文的适宜程度； 很少会出现字母“Q”或“Z”。
We want to know whether a given vector field with components P, Q and R can be written as f sub x, f sub y and f sub z for a same function f.
要看向量场,能否写成，其中f是同一个函数。
Xu M. -z., Luo L. -s., Li Y., Wu Y. -q., Jiang X. -h., Xu J. -s. Intravascular ultrasound versus coronary angiography in coronary artery stent implantation.
许美珍，罗来树，李颐，吴延庆，姜醒华，徐劲松血管内超声与冠状动脉造影在冠状动脉支架置入中的应用比较。
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