【单选题】以下电路中,( )有一个稳定状态和一个暂稳态。
【简答题】Read text 2 with five gaps. Choose the best sentence or phrase from the list A~F. (There is one extra item.)
【简答题】Listen to five conversations. For each sentence 26-30, choose the correct ending a , b , c or d . Listen twice. Choose the right answers.
【单选题】Read the sentences and choose the sentence which is more appropriate in academic articles 本次试验失败的原因大致有 5 个。
A.
There are about five causes for the failure of the experiment
B.
There are approximately five causes for the failure of the experiment.