国开在线答案
- 2024-03-05 [单选] Whichofthefollowingcarbocationsismoststable?
- 2024-03-05 [单选] Themostsignificantconstituentsofpetroleumare.
- 2024-03-05 [单选] （）isthechemicalthatisproducedinthelargesttonnage.
- 2024-03-05 [单选] Organicchemicalsmainlycomefromoil,naturalgas,and（）.
- 2024-03-05 [单选] Themainconstituentsofplantsare（）.
- 2024-03-05 [单选] Modernchemicalindustrybeganaround.
- 2024-03-05 [单选] Abatchreactorisdefinedasaclosedspatiallyuniformsystemwhichhasconcentrationparametersthatarespecifiedattimezero.句中which为关系代词，引导（）从句，指代system。
- 2024-03-05 [单选] Theotherlimitwherethefluidflowissimpleisthetubularreactor,wherethefluidiscompletelyunmixedandflowsdownthetubeasaplug.句中第二个where是关系副词，引导（）从句。
- 2024-03-05 [单选] Incountercurrentflow,thecoolanthasbeenheatedbeforeitreachesthisregion,whileincocurrentoperation,thecoolantisthecoldestexactlywheretheheatloadisgreatest.句中连词while引导状语从句，表示对比，意思是（）
- 2024-03-05 [单选] Essentiallyconstantconditionsareknowntoexistinboththehorizontalandverticaldirectionsinbothshortandlongbeds.句中含有两个“both…and…”并列结构，意为（）。