问题
选择题
He was born ______ 1994, ______ a cold morning ______ October. [ ]
A. in, on,／
B. in, on, of
C. in, in,／
D. in, in, of
答案
答案：B
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He was born ______ 1994, ______ a cold morning ______ October. [ ]
A. in, on,／
B. in, on, of
C. in, in,／
D. in, in, of
答案：B
＋3
＋aH＋＝2Cr3＋＋3Y＋4H2O下列说法不正确的是
时转移的电子数是3×6.02×1023