28. Who may have lower serum vitamin D level? (A) Elderly； (B) Dark skin (black) people； (C) Obese individuals； (D) All of the above.

20. Which of the following is true of a blocking system call? (A) The application continues to execute its code when the call is issued. (B) The call returns immediately without waiting for the I/O to complete.(C) The execution of the application is suspended when the call is issued. (D)Blocking application code is harder to understand than nonblocking application code (E) None of the above

28. Who may have lower serum vitamin D level? (A) Elderly； (B) Dark skin (black) people； (C) Obese individuals； (D) All of the above.

其他試題

28. Who may have lower serum vitamin D level?
(A) Elderly；
(B) Dark skin (black) people；
(C) Obese individuals；
(D) All of the above.