200℃油炸食品时，杂环胺主要在油炸的后期形成。
参考答案：错
For a moment nothing happened Then _____ all shouting together.
A．voices had come
B．came voices
C．voices would come
D．did voices come
tRNA的翻译后修饰（）
A.由核酶催化
B.与并接体结合后完成
C.包括加入3′末端的CCA-OH
D.是自我剪接过程
