服用降压药物改变体位时应遵循“三部曲”即( ) 

　　A、平躺10s，坐起10s，站立10s后再行走 

　　B、平躺20s，坐起20s，站立20s后再行走 

　　C、平躺30s，坐起30s，站立30s后再行走 

　　D、坐起30s，站立30s后,行走30S 

　　E、平躺60s，坐起60s，站立60s后再行走

参考答案：

C