【单选题】Helmholtz free energy is a thermodynamic potential that measures the useful work obtainable from a closed thermodynamic system at:
A.
A constant temperature and pressure
B.
A constant temperature and volume
C.
A variable pressure and variable temperature
【单选题】化学危险品试剂的管理不包括以下哪种方式
C.
压缩气体和液化气体要避免日晒,不能放置在热源附近
D.
易燃品的库房应通风散热、阴凉干燥,并有防热降温设施
E.
有毒物品可存放在开放的试剂柜中,需要时可随时取用
【单选题】以下哪项不属于诗人“故国平居有所思”指向的内容?
【简答题】The work obtainable equals that expended. (定语词序调整)
【简答题】危险化学试剂一般包括___________、__________、___________、___________、_____________、____________等
【简答题】材料1:华西集团董事长吴仁宝认为,中国加入世贸后,国内国际市场形势将有较大变化,为此华西的经济要进行新的调整。华西的竞争对手主要来自“两大”,即大的国有企业和大的外贸企业、外商独资企业。加入世贸之后,国外的大公司、大企业将不断涌入中国,这些企业具有技术含量高、产品档次高、公司信誉高等优势,这对国内企业冲击很大。
材料2:红豆集团早在1993年就开始做好迎接入世的准备。目前该集团已在54个国家和地区...
【单选题】危险品的分类,根据常用化学试剂的危险性质大致可分为三类,其中不包括( )。
【多选题】Marshall Hall's five principles (1831) for animal welfare are:
A.
An experiment should never be performed, if the necessary information could be obtained by observations. No experiment should be performed without a defined, obtainable, objective.
B.
Scientists should be well informed about the work of their predecessors and peers in order to avoid unnecessary repetition of an experiment.
C.
Justifiable experiments should be carried out with the least possible infliction of suffering (often through the use of lower, less sentient animals).
D.
Every experiment should be performed under circumstances that would provide the clearest possible results, thereby diminishing the need for repetition of experiments.