I was trying to get into the _____ bus when I heard a voice from behind.
I was trying to get into the \_\_\_\__ bus when I heard a voice from behind.
用作
下列仪器中不能加热的是____；能直接放在火焰上加热的是____；要放在石棉网上加热的是____．①坩埚②烧杯③烧瓶④蒸发皿⑤锥形瓶⑥量筒⑦试管⑧容量瓶⑨集气瓶⑩水槽
下列仪器中不能加热的是\_\_\_\_；能直接放在火焰上加热的是\_\_\_\_；要放在石棉网上加热的是\_\_\_\_．①坩埚②烧杯③烧瓶④蒸发皿⑤锥形瓶⑥量筒⑦试管⑧容量瓶⑨集气瓶⑩水槽
A _____ language is one which is still spoken by people in the course of their everyday lives.
A \_\_\_\__ language is one which is still spoken by people in the course of their everyday lives.
The pot _____ for _____ hot water.
The pot \_\_\_\__ for \_\_\_\__ hot water.
二氟甲烷是性能优异的环保产品，它可以代替会破坏臭氧层的“氟利昂”用作致冷剂，试判断二氟甲烷的结构简式（ ）．
二氟甲烷是性能优异的环保产品，它可以代替会破坏臭氧层的“氟利昂”用作致冷剂，试判断二氟甲烷的结构简式（ ）．
发展饲用作物 调整种植业结构 促进西南农区草食畜牧业发展战略研究.pdf
本书包括综合报告、专题报告和调研报告三个部分，不仅从战略高度论证了在西南农区构建“粮－经－饲”三元种植业结构，发展种草养畜的必要性和可行性，而且还分析了西南农区的种养业结构现状、发展潜力和亟待解决的问题，并从现代农业发展要求和西南农区的实际出发，提出了具体的战略构想、相关建议，以
I woke up with _____ bad headache, yet by _____ evening the pain had gone.
I woke up with \_\_\_\__ bad headache, yet by \_\_\_\__ evening the pain had gone.
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