装有双金属热脱扣器的自动开关，其保护特性具有（）。
A、反时限特性
B、定时限特性
C、瞬时动作特性
参考答案：A
一年轻患者。咽痛、咳嗽、乏力、肌痛2周，伴纳差。X线检查示右下肺多形性浸润影，呈节段性分布，宜给予( )
A．青霉素
B．红霉素
C．氟哌酸
D．阿莫西林
E．头孢唑啉
请你用所给词的适当形式完成下列句子.
1. Here are some things they have learned from _____ (scientist ) studies.
2. Sunglasses are used for _____ (keep) out the sun.
3. The students are _____ (confuse) about the _____ (confuse) problem.
4. I'm considering _____ (study) in Beijing or Shanghai.
5. I felt _____ (embarrass) when everyone looked at me.
