【单选题】Take care! Accidents _________ happen along this part of the road.
【多选题】下列可用于土壤消毒来防治苗木立枯病的是( )
【简答题】消石灰沙浆广泛用于粘合砖石,细软的消石灰沙浆最后硬化而和砖、石结成一体.试回答: (1)消石灰沙浆表面会迅速硬化的主要原因是______(说明原因后,写出相应的化学方程式). (2)硝石灰里的Ca(OH) 2 和细砂里的SiO 2 有无可能发生反应?说明理由(如认为可能发生反应的,则要写出相应的化学方程式)______.
【单选题】The number of traffic accidents that _______ in developing countries _______ increasing.
【简答题】Accidents happen almost every day. Some accidents are not serious and some are. We read about such accidents nearly every day in the newspapers. It is wrong for people to think that accidents take pla...
【简答题】消石灰沙浆广泛用于粘合砖石,细软的消石灰沙浆最后硬化而和砖、石结成一体.试回答: (1)消石灰沙浆表面会迅速硬化的主要原因是 _________ (说明原因后,写出相应的化学方程式). (2)硝石灰里的Ca(OH) 2 和细砂里的SiO 2 有无可能发生反应?说明理由(如认为可能发生反应的,则要写出相应的化学方程式) _________________ .
【单选题】On rainy days, accidents ______ happen sometimes on steep roads.
【单选题】Although accidents do happen, skiers will be reasonably safe if ______.
A.
they stay on the officially approved slopes
B.
they ski only for pleasure
C.
they ski only at resorts
D.
they choose less crowded ski slopes
【单选题】在拌制石灰稳定土时,宜用1~3级的新石灰,可不经消解直接使用是( )。
【单选题】会阴左侧斜切开术后,应指导产妇什么体位休息