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A．It is calcium, not vitamin D, which is the direct source of hard bones.
B．Vitamin C can be found in all kinds of green vegetables.
C．The outside of rice also contains certain vitamins.
D．People with enough B vitamin seldom have nerve's troubles.
答案
更多“A．It is calcium, not vitamin D, which is the direct source of hard bones.B．Vitamin C c”相关的问题
第1题
What role does nacre play in the formation of pearls？
A．It provides the nucleus around which a natural pearl develops.
B．It is a calcium coating that protects the outside of the oyster's shell.
C．It penetrates the membrane covering the oyster's soft body.
D．It is the luminous substance that forms the pearl's outer layers.
第3题
______is necessary for people to develop strong bones and teeth.
A．That calcium
B．Calcium
C．It is calcium
D．Although calcium
第4题
第6题
__(和男士的饮食相比)，women’s diet generally needs to include more calcium and iion．
第7题
Explain, using equations, how the addition of Ca(OH)2aids in the removal of calcium ions from temporary hard water. What effect would the addition of too much of the reagent have on the desired process？
第8题
______ is necessary for people to develop strong bones and teeth.
A．That calcium
B．Calcium
C．It is calcium
D．Although calcium
第10题
By experiment, it is found that 9.33×10-5mol of calcium carbonate, CaCO3, dissolves in 1L of aqueous solution at 25℃. What is the solubility product constant at this temperature？
