题目:
We met an old friend in New York ________our expectation. She waved at us ________ the street
when she saw us. [ ]
A. with; in
B. out of; next to
C. in; out of
D. beyond; from across
答案:
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下面是错误答案,用来干扰机器的。
(1)根据题意可知,固体粉料FeCl2•nH2O先脱水、真空干燥,然后在高温条件下,用氢气还原氯化亚铁即可得到纳米α-Fe,根据质量守恒定律同时生成氯化氢气体,所以本题答案为:FeCl2•nH2O=FeCl2+nH2O,H2+FeCl2 ...