【多选题】There are sme stages of overall analytical process in an environmental investigation.Which of the following are correct?( )
A.
definition of the aims;
B.
selection and development of appropriate method;
C.
sampling plan,sample collection,sample handing and pretreatment;
G.
assessment and interpretation of results;
【判断题】电流流过电阻产生的热量为Q= 0.24IRt。 ( )
【简答题】[A] stages [B] periods [C] years [D] sessions
【简答题】The stages of sleep take on ____Sleep is part of a person's daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If you are an average sleeper, your sleep c...