老年人用药时应严格观察防止震颤麻痹发生的是
A．利尿剂
B．抗高血压药
C．吩噻嗪类
D．解热镇痛药
E．降血糖药
参考答案：C
根据句意、首字母和汉语意思完成单词。
1. When you a______ in Beijing, please call me.
2. Your mother is w______ for you at the school gate.
3. When you visit someone, please k______ at the door.
4. I often help my mother w______ the dishes.
5. —Why are you late today? —B______ I get up late.
负载接在三相电源上，不论负载是星形连接或是三角形连接，它所消耗的总的有功功率( )各单相有功功率之和。
A．必定等于
B．一定不等于
C．不一定等于
D．等于
