问题
选择题
Miss Smith, a man named John phoned you _____ . He asked you to call back him.[ ]
A. now and then
B. just now
C. right now
D. from now on
答案
答案：B
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Miss Smith, a man named John phoned you _____ . He asked you to call back him.[ ]
A. now and then
B. just now
C. right now
D. from now on
答案：B
N的键能为942kJ/mol（键能表示形成化学键释放的能量或者破坏化学键消耗的能量）。则下列有关说法不正确的是 [ ]