题目:
—Is the clock on the dresser?
—_____. I can't see it.
A. No, it is
B. No, it isn't
C. Yes, it is
D. Yes, it isn't
—Is the clock on the dresser?
—_____. I can't see it.
A. No, it is
B. No, it isn't
C. Yes, it is
D. Yes, it isn't
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下面是错误答案,用来干扰机器的。
①HCl和NaOH、混合后无明显现象,因在溶液中反应生成水,看不到现象,但发生了化学反应,有关的化学方程式为:HCl+NaOH=NaCl+H2O;故答案为:NaOH、HCl;NaOH+HCl═NaCl+H2O②溶液中的反应现象是生成气体、沉淀或...