用括号内所给单词的适当形式填空。

1. We should often exercise to stay _____ (health).

2. Sam says, "Mary is _____ (heavy) than me".

3. I can't go to school, I have to rest today, because I have a _____ (head).

4. We go to the movies _____ (one) a month.

5. Chinese medicine is now popular in many _____  (west) countries.

开关电源系统下列（）故障属于严重故障。

A.基础直流电源设备中监控模块故障，造成整流系统无输出

B.基础直流电源系统中后备电池熔丝熔断

C.-48V基础直流电源系统中后备电池单体故障只数数量多或电池容量严重下降到额定容量的80%以下

D.基础直流电源设备中整流系统全部或部分停止工作，导致后备电池放电