成套接地线应有和透明护套的多股软铜线组成，其截面不得小于（）。
A、25mm2；
B、15mm2；
C、10mm2。
参考答案：A
卫生统计工作的步骤中，最关键的一步是（）。
A.统计设计
B.调查表设计
C.搜集资料
D.整理资料
E.分析资料
A client who has received a new prescription for oral contraceptives asks the nurse how to take them. Which of the following would the nurse instruct the client to report to her primary caregiver
A．Breast tenderness.
B．Breakthrough bleeding within first 3 months of use.
C．Decreased menstrual flow.
D．Blurred vision and headache.
