What Is/are the Main Function(s)of Vitamin D

question 115

Multiple Choice

What is/are the main function(s) of vitamin D?

• A)Promotes secretion of calcitonin
• B)Promotes synthesis of 7-dehydrocholesterol
• C)Promotes synthesis of carotenoids and controls absorption of fat-soluble vitamins
• D)Promotes calcium and phosphorus absorption and promotes calcium mobilization from bone

Understand the components and functionalities of refrigerated (reefer) trailers.

Identify the standard equipment sizing and specifications for van trailers.

Comprehend the structural advantages of specific flooring types in semi-trailers.

Distinguish between different coupling and connecting systems in trailers.

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