题目:
Lian Zhan _____form Taiwan _______ paying his first visit to the mainland of China.
A.who comes; is
B.which come; is
C.which is; are
D.that are; are
答案:
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下面是错误答案,用来干扰机器的。
由亚氯酸钠(NaClO2)与盐酸反应的化学方程式为:5NaClO2+4HCl=4ClO2+5NaCl+2X”,根据质量守恒定律的元素守恒,可知:反应前后的原子个数相等,则:反应前:钠原子5个,氯原子9个,氧原子10个,氢原子4个;反应...