A:氯化氢分子的电子式:
B:乙烯的结构简式:CH2=CH2
C:苯的分子式:C6H6
D:原子核内有10个中子的氧原子:
A. Good morning, Cutie!
B. Today is your birthday. Happy birthday!
C. Good morning, Mum!
D. Thank you, Mum
E. Let's cut the cake together.
F. OK. Let's cut!
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