... PO 4 - 活度常数(activity constant)： HA+B A - +HB + K 0 = a A - a HB + /( a HA a A - ) 浓度常数(concentration constant)： K c = [A-] [HB+] / [HA] [B]= K 0 /（r HB + r A - ） 混合常数(mix constant)：K mix 有浓度，有活度 3.1.3 溶液中其它相关...
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... 累积稳定常数;cumulative stability constant 浓度常数;浓度稳定常数;concentration constant 三乙酰氧基硼氢化钠;STAB;Sodium triacetoxyborohydride ...
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concentration-constant zone 恒浓区
specific ion concentration constant 离子浓度比常数
constant concentration 固定含量 ; 恒浓度
concentration equilibrium constant 浓度平衡常数
constant surface concentration 固定表面浓度
constant concentration layer 等浓度层
constant vapor concentration 恒定汽相浓度
So this is where the concentration of B is roughly constant over time.
那么这是B的浓度，粗略地随时间变化保持常量。
In response to the appearance of such variants in the cell population the concentration of the toxic chemical in the growth medium is increased, thus keeping the selection pressure constant.
为应对细胞污染中出现的变异，有毒物质的浓度是逐步增加的，以此保证筛选力度的稳定。
Now, scientists report that they've created a contact lens that can deliver a high concentration of antibiotic at a constant rate for more than 30 days.
目前，科学家报告称他们已经创造出了一种隐形镜片，它能以固定速度持续释放高浓度抗生素超过30天。
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