单群理论 one-group theory

[名词解释] 多群理论 multigroup theory

[单选题]The engine has one or two group of fuel pumps, depending upon （）.A . the number of fuel valvesB . the number of cylindersC . the speed of engineD . the power of engine

[单选题]Of the reptilegroups,the snake group was the [final] one to appear.A.lastB.

[名词解释] 连锁群（linkage group）

[名词解释] 群截面 group cross section

[名词解释] 中子能群 neutron energy group

[名词解释] 细菌生理群 physiological group of bacteria

[名词解释] 扩散理论 diffusion theory

[名词解释] 群分出截面 group removal cross section

[名词解释] 化学渗透理论(chemiosmotic theory)