影响CZ直拉法的两个主要参数是（）和（）。
参考答案：拉伸速率；晶体旋转速率
— _____?
— He said he was coming but he hasn't _____ yet. [ ]
A. Does he come tonight, come
B. Is he coming tonight, appeared
C. Will he come togight, presented
D. Why not come tonight, seemed
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