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【单选题】
It was important for the president to continue his schedule， regardless _______ the bomb threat。A.
of
B.
by
C.
from
D.
with
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举一反三
【简答题】U3Listening 3.mp3: Experts believe that fireworks were invented in China, in the 2nd century BC. There is a well-known story about a Chinese cook ___1___ fireworks thousands of years ago. He simply mi...
【多选题】要防止室内开门发生回燃伤害,开门应做到
A.
缓慢逐步打开一条缝
B.
利用水枪对房间上部扫射
C.
人员做好全面防护（空呼、手套、披肩、头套）
D.
人员采取低姿站于门侧
【简答题】怎样证明酶是蛋白质?
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