在乙酰苯胺的反应中,温度需控制在()范围内,以确保反应完全。
A. 100℃以下
B. 100℃-110℃
C. 110℃-120℃
D. 120℃-130℃
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乙酰苯胺的合成实验中,回流装置中用来冷凝的仪器是()。
A. 直形水冷凝管
B. 球形水冷凝管
C. 空气冷凝管
D. 刺形分馏柱
乙酰苯胺的制备除了可以用醋酸作酰化试剂外,还可以采用其它的什么酰化试剂?
A. 乙酰氯
B. 乙酸乙酯
C. 乙酸酐
D. 乙腈
Phrase structure rules allow us to better understand _____.
A. how words and phrases form sentences.
B. what constituties the grammaticality of strings of words.
C. how people produce and recognize possible sentences.
D. all of the above.
Syntactic movement is dictated by rules traditionally called ____.
A. transformational rules
B. generative rules
C. prhase structure rules
D. x-bar theory