正常食管有两种蠕动,即()、()。
参考答案:原发性蠕动(第1蠕动波);继发性蠕动(第2蠕动波)
根据中文提示,填入单词的适当形式。
小题1:This station ______________(广播) round the clock in six languages.
小题2:Despite a lot of ________________ (准备) , we didn’t win the contest.
小题3:The river flows very fast here, and bathing is ______________ (禁止).
小题4:Train services are back to _______________ (正常) again after the strike.
小题5:The first impression really _____________ (重要) in the job interview.
池杉和水杉在根上的共同点是都有()。