chemicals和chemical有何差别是可数名词吗?

chemicals和chemical有何差别是可数名词吗? 有chemicals吗?chemical不是不可数吗? 化工助剂(AUXILIARY CHEMICALS)是指哪些?有何用途? chemical bolt和chemical 怎么翻译Chemicals are carried in bulk in chemical carriers. chemicals是农药吗?还是chemical?可数还是不可数 一道英文选词填空题A chemical reaction involves the change of chemicals called______ to new chemicals called ________.可选的词有：products reactants energy combustion Thermal decomposition light non-chemical 和chemical free There is a bottle of__in the hand of the ___teacher.A chemical;chemicalB chemistry;chemistryC chemicals;chemistryD chemicals;chemist 请问And it is called chemical change.和And it called chemical change有什么区别? 请问And it is called chemical change.和And it called chemical change有什么区别? too much chemicals 和too many chemicals的差别 为什么My chemical romance和the used有仇? 英语翻译NOTE:The use of a central chemical storage area for locating unused chemicals is recommended for efficient use of chemicals.Chemicals that cannot be used should be placed in a staging area (temporary accumulation area).Each laboratory mus There is a new( ) lab in our school.A.chemical B.chemistry C.chemicals D.chemistry's We must keep away from some___,for they will do harm to our health.chemistry chemists chemical chemicals the farmers use too many chemicals和the farmers use too much chemicals的差别? Famers use chemicals too much in their fields.为啥用too 牧场而不是too many,chemical不是不可数吗为用复数?