材料烘干状态下的质量/材料在自然状态下的体积,得出的是()。
A.材料的密度
B.材料的表观密度
C.材料的堆积密度
D.材料的干表观密度
参考答案:D
下列离子方程式正确的是( )
A.向Ba(OH)2溶液中,逐滴加入明矾溶液至Ba2+恰好完全沉淀,反应的离子方程式:2Ba2++4OH-+2SO42-+Al3+=2BaSO4↓+AlO2-+2H2O
B.碳酸氢钠溶液与少量石灰水反应:HCO3-+Ca2++OH-=CaCO3↓+H2O
C.
在足量烧碱液中水
+2OH-→
+CH3COO-+2H2O
D.向C6H5ONa溶液中通入少量CO2:2C6H5O-+CO2+H2O→2C6H5OH+CO32-
If you _________ my advice, you ________ your failure now. You _________ your victory ?[ ]
A. took ... wouldn't cry over ... would celebrate?
B. had taken ... wouldn't have cried over ... would have celebrated?
C. had taken ... aren't crying over ... are celebrating?
D. had taken ... wouldn't be crying over ... would be celebrating