根据2.4×7=16.8,写出两道除法算式是:( ),( )。
16.8÷7=2.4;16.8÷2.4=7
____ apple fell from the tree and hit him on ___ head.
A.An; his
B.The; the
C.An; the
D.The; /
国标甲醇产品中的碱度指标是以()计的。
A、氢氧化钠
B、氢氧化钙
C、氨
D、氢氧化钾