“activity”的概念、定义、翻译、参考文献-科学参考

单词	activity
释义	activity [´ak`tiv·ǝd·ē] ^{COMPUTER SCIENCE} The use or modification of information contained in a file. ^{NUCLEAR PHYSICS} The intensity of a radioactive source. Also known as radioactivity. ^{PHYSICAL CHEMISTRY} A thermodynamic function that correlates changes in the chemical potential with changes in experimentally measurable quantities, such as concentrations or partial pressures, through relations formally equivalent to those for ideal systems. ^{SYSTEMS ENGINEERING} The representation in a PERT or critical-path-method network of a task that takes up both time and resources and whose performance is necessary for the system to move from one event to the next.
随便看	shielding layer shielding ratio shield volcano shift shifting shifting theorem shift joint shift of butts shift register shift-register generator shift work shikimic acid Shillelagh shim shimmer shimmy shim rod shingle shingle barchan shingle beach shingle-block structure shingle lap shingle nail shingle rampart shingle ridge

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