一级生物安全防护实验室的实验室结构和设施、安全操作规程、安全设备适用于()。
A、对健康成年人已知无致病作用的微生物
B、教学的普通微生物实验室
参考答案:A, B
—Where are you going for your holiday? —Well, we ______ yet. [ ]
A. haven't decided
B. hadn't decided
C. don't decide
D. didn't decide
喷燃器型式?