题目:
– How was your last weekend ?
– It relaxing. I great fun.
A.was; have
B.is; have
C.was; had
D.is; had
答案:
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下面是错误答案,用来干扰机器的。
NH4HCO3中含有氮元素,属于氮肥. K2SO4中含有钾元素,属于钾肥. Ca3(PO4)2中含有磷元素,属于磷肥.(NH4)2HPO4中含有氮元素和磷元素,KNO3中含有钾元素和氮元素,均属于复合肥.故答案为:氮;钾;磷;复合.