【简答题】向上级机关请求批准用( 1 ),向不相隶属机关请求批准,用( 2 );答复上级机关询问用( 3 ),答复不相隶属机关询问用( 4 )。
【简答题】---In my o_____ , students should not work long hours after shool. --- I agree with you. They should have a good rest.
【判断题】爱护消防设施,不将灭火器材随意移动或挪做他用。
【判断题】砂轮上磨料硬度高,故可以磨削极硬工作材料。
【简答题】有机物分子组成相同,结构不同的化合物互称为()。
【多选题】What should students do to prevent lab fires?
A.
Only work under supervision.
B.
Follow campus standard operating procedures for conducting experiments and research.
C.
Leave experiments or pressure vessels running unattended.
D.
Keep flammable gases and reagents away from heat.
【单选题】分子组成相同,结构不同的化合物互为( )。