表示杂质在硅-二氧化硅界面处重新分布的性质和程度，习惯上常用（）。
A.分凝度
B.固溶度
C.分凝系数
D.扩散系数
参考答案：C
袁世凯担任中华民国临时大总统初期，迫使唐绍仪内阁辞职，并组建新内阁，以下表述，不正确的是 [ ]
A、破坏了《临时约法》
B、在共和外衣下，加强专制统治
C、目的在于迫使新内阁成为其御用工具
D、企图复辟帝制
用 come about, happen, take place, break out, occur 的正确形式填空.
① I was out of town at the time, .so I don't know exactly how it _________ .
②The meeting _________ at 8:00 as planned.
③It ________ to rain that morning.
④A fire ________ in the hotel last night.
⑤It suddenly ________ to me that I had left my key in the office.
