The heptanal butyl mercaptan was synthesized with heptanal, sodium thiosulfate and 1 bromobutane as raw materials.以正庚醛 、 硫代硫酸钠和溴代正丁烷为原料,合成了正庚醛正丁硫醇缩醛....
Three mortar shells had landed close to a crowd of people.3枚迫击炮弹落在人群旁。Enemy forces lobbed a series of artillery shells onto the city.敌军对该城发起连串炮轰。Cut the lobster shells into small pieces with heavy-duty scissors.用粗剪将龙虾壳剪成...