单词拼写(单句首字母填空)。 (1) The best time to visit New York is in O. (2) The twelfth month of a year is D. (3) Tree Planting Day comes on the t of March. (4) Great changes have taken place in my home town in the t century. (5) Whenever she makes decisions, her family always comes f. 答案:【1】October
【1】December
【1】twelfth
【1】twentieth
【1】first
用惰性电极电解下列溶液一段时间后,再加入一定量的另一种物质(方括号内),溶液能与原来溶液完全一样的是
[ ]
A.
CuCl2[CuSO4]
B.
NaOH[NaOH]
C.
NaCl[HCl]
D.
CuSO4[Cu(OH)2]