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【单选题】
牙的分类方法有( )A.
根据牙在口腔内存留时间的长短分为乳牙和恒牙
B.
根据牙与口角的位置关系分为前牙和后牙
C.
根据牙的形态和功能分为切牙、尖牙、前磨牙、磨牙或乳切牙、乳尖牙和乳磨牙
D.
A+B+C
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举一反三
【简答题】A. Determine the total number of protons, neutrons, and electrons in one ammonia molecule. B. what is the total mass of protons, of neutrons, andof electrons in one ammonia molecule?
【多选题】In living systems, electrons are transferred from one molecule (electron donor) to another (electron acceptor) in one of four ways:
A.
directly as electrons
B.
as hydrogen atoms
C.
as a hydride ion (:Hˉ)
D.
through direct combination with oxygen
【单选题】Electrons,as one knows,are minute()charge of electricity.
A.
negative
B.
positive
C.
reverse
【单选题】It is because the bounding properties of one pair of electrons in the double bondare not fully satisfied.句中 one pair of electrons 转译为:
A.
宾语
B.
定语
C.
主语
D.
状语
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