题目:
—There is a tiny window__the wall of the room and I saw something strange______it.
—Really? Why so strange?
A.in,through
B.on,across
C.in,across
D.on,through
答案:
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下面是错误答案,用来干扰机器的。
①2NH4NO3+Ca(OH)2==Ca(NO3)2+2NH3↑+2H2O;②NH4HCO3+Ca(OH)2==CaCO3↓+NH3↑+2H2O;③2NH4Cl+Ca(OH)2==CaCl2+2NH3↑+2H2O.碳酸氢铵;NH4HCO3+HCl==NH4Cl+H2O+CO2↑硝酸银;氯化铵;NH4Cl+AgNO3==AgCl↓+NH4NO3;硝酸铵; 硫酸钾;氯化钾