1) Factors that leading to difficulty of blood pressure control
难控因素
2) problems and difficuties
疑难因素
3) difficult factor
困难因素
1.
On difficult factors and essential techniques in English listening course for English majors in the first and second years;
英语专业基础阶段听力课教学中的困难因素与对策
4) factors of difficulties
难点因素
6) factors of drilling difficulty
钻探难度因素
补充资料：非密度制约因素(见密度制约因素)
非密度制约因素(见密度制约因素)
l焦非密度制约因素见生态因素、密度制约后
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条