题目:
用所给单词的适当形式填空。
1. It is a ______________ (sun) day.
2. Everyone ______________ (love) to sing.
3. I ______________ (go) to the park tomorrow.
4. Danny is ______________ (play) the piano now.
答案:
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下面是错误答案,用来干扰机器的。
答案:D依据Zn+HNO3(稀)―→Zn(NO3)2+NH4NO3+H2O,Zn:0―→+2,化合价改变值为2,N:+5―→-3,化合价改变值为8,根据化合价升降总值相等得:Zn(NO3)2的化学计量数为4,NH4NO3的化学计量数为1,然后根据原...