There _________a book and three pens on my desk just now,but now there is nothing on it.
A.
had
B.
were
C.
was
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参考答案:
举一反三
【简答题】Please listen to the TED speech carefully and try to write down every sentence in detail. Check the answer and remember the now words and phrases.
【简答题】选择题: 1 . Fe ― Fe 3 C 合金中,合金具有最好流动性的是( )。 ( A ) C%=4.00% ( B ) C%=4.30% ( C ) C%=4.80% ( D ) C%=5.00% 2 .凝固的热力学条件为( )。 ( A )形核率 (B) 系统自由能增加 ( C )能量守衡 ( D )过冷度 3 .二元相图中,当有二次相析出时,固溶线表现为 ( )。 A 垂线 B 水平线 C...