【多选题】实验中,关于称取镁条的质量,下列说法正确的是( )。
A.
镁条的质量少,称量误差大,产生的氢气少,读数误差也大,测定结果不准确
B.
镁条的质量多,产生的氢气过多,会导致量气管无法读数
C.
以产生30 mL左右的氢气来称取镁条的质量为宜
D.
以产生近50 mL的氢气来称取镁条的质量,这样称量误差和读数误差都更小
【简答题】K型热电偶的长期测量温度为( ),短期测量温度为( )
【单选题】According to the passage, the declarative memories could be
A.
affected by the memory of general facts and specific events.
B.
determined by some specific structures in the brain.
C.
expressed as changes to the structure and function of neurons.
D.
communicated to create new connections of neurons.
【简答题】D Here are a few tips we’ve put together to help you learn English well. Speak, speak, speak! Practise speaking as often as you can—even speaking to yourself is good practice. Try recording yourself w...
【简答题】A.speak B.have C.link D.put
【单选题】According to the law of that country, the Parliament will have to be ______ before the General Election.