皮皮学，免费搜题
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【单选题】
氨基酸不具有的化学反应是A.
成肽反应
B.
异硫氰酸苯酯反应
C.
茚三酮反应
D.
双缩脲反应
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】There was a ( ) of two hours before the plane took off. 飞机起飞推迟了两个小时。 His delay made the teacher angry. ____________________________ ...as the delay in getting the meeting started was ...
【简答题】n My First Day in New York n I arrived in the United States on Feb. 6, 1986, but I remember my first day here very clearly. My friend was waiting for me when my plane landed at Kennedy Airport at thre...
【多选题】儿童易发生急性化脓性中耳炎或乳突炎的原因有
A.
与成人比较，咽鼓管相对短、宽、平、直
B.
咽部淋巴组织丰富，常增生肥大，因而易藏匿细菌和病毒
C.
中耳局部的免疫功能发育不全
D.
中耳、乳突结构畸形
E.
机体抵抗力较差，患各种上呼吸道传染病的机会较多
【简答题】2 Replace the underlined words with a
prepositional phrase that has the same meaning. ► We’ll need not less than two hours to
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【简答题】The plane took very late up.
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