在充装F22钢瓶时,HCFC22的充装系数按()kg/L进行充装。
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Which of the following descriptions about the amount of Vitamin D intake is true？
A. The upper limit of Vitamin D intake for adults is 400 lUs.
B. It is dangerous for adults to take 2,000 lUs Vitamin D daily.
C. An overdose of Vitamin D does not necessarily result in diseases.
D. For people under 50, it is safe to take 200 lUs Vitamin D daily.
Which of the following is true of Darwins theory of evolution？
A. It was initiated as a weapon against religion.
B. It offered solider evidences against religion than geology.
C. It split the religionists into two opposing groups.
D. It met strong oppositions from religionists.
Which one of the following statements is TRUE according to Para. 1 ？
A. The amount of Vitamin D intake for the author"s first child is a half of that for her third child.
B. The author"s new born baby was taking Vitamin D pills.
C. Sunshine can help produce Vitamin D.
D. The author"s second child did not have any Vitamin D supplement when born.
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