【判断题】( )正常婴幼儿睡眠的表现是入睡快、睡得安稳、无鼾声。
【单选题】Choose the word that can replace the underlined part in the sentence without changing its orignal meaning. Civil strife and bloodshed made the people of that country shudder .
【判断题】Km 值即米氏常数,为酶催化反应速度等于最大反应速度一半时的酶浓度。