To obtain a good monitor tracing on a client in labor, the mother lies on her back. Suddenly, she complains of feeling light-headed and becomes diaphoretic. Which of the following should be the nurse’s first action

A. Reposition the client to her left side.
B. Immediately take the client’s blood pressure and call the physician.
C. Start oxygen at 6 L via nasal cannula.
D. Increase the IV fluids to correct the client’s dehydration.

在Java的基本数据类型中，char型采用Unicode编码方案，每个Unicode码占用______字节内存空间，这样，无论是中文字符还是英文字符，都是占用______字节内存空间。