NKC activity in every group were significantly lower than control group expected carcinoma of colon group(P<0.05, P<0.01).
各组NKC活性均有下降，除肠癌组外其余各组均显著低于对照组（P＜0．05，P＜0．01）。
Synthesis of dimethyl succinate from succinic acid and methanol on cation exchange resin NKC-9 was studied under adsorption dehydration with 3A zeolite adsorbent.
以阳离子交换树脂NKC-9固体酸为催化剂、丁二酸和甲醇为原料，采用分子筛吸附脱水技术合成丁二酸二甲酯。
Ethanol and tert-amyl alcohol were employed to synthesize tert-amyl ethyl ether in the liquid phase at atmospheric pressure. The strong acid cation exchange resin, NKC-29, was used as catalyst.
用国产NKC-29型强酸性阳离子交换树脂为催化剂，在常压液相条件下用乙醇和叔戊醇为原料合成了乙基叔戊基醚。
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