气体灭火系统采用自动控制启动方式时,根据人员安全撤离防护区的需要,应有不大于30s的可控延迟喷射。
参考答案:对
炎症显像剂99mTc-AGAB的优点中,不包括()
A.适用于诊断慢性炎症
B.一步法标记
C.显像剂来源方便、价廉
D.核素能量适中、图像质量佳
E.肝脾有较低的放射性,特别适用于肝脓肿的诊断
完成下列句子的同义表达
1. John is better at playing football than Peter.
John __________ __________ __________ playing football than Peter.
2. Why don't you ask our English teacher for help?
__________ __________ __________ our English teacher for help?
3. Yes, I agree.
Yes, I have __________ __________ idea __________ you.
4. Betty's mum doesn't think that today people eat as well as in the past.
Betty's mum thinks that today people eat __________ __________ in the past.
5. Now we don't have as much free time as we did before.
Now we have __________ __________ __________ than we did before.