题目内容

Lesson 4 short exchange listening-3

A. in and out
B. loud and clear
C. unreadable
D. readable but with difficulty

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Lesson 4 short exchange listening-4

A. due squawk noise
B. due background whistle
C. due broken transmission
D. due unreadability

Lesson 4 short exchange listening-5

A. Due fast speed
B. due broken transmission
C. due unstable signal
D. due background whistle

EPC系统主要包括哪5个组成部分？并用箭头表示信息的流向。

常用的检测细胞毒效应的方法是：

A. 31P掺入法
B.125I释放法
C. 51Cr释放法
D. 形态学检测法
E. 移动抑制试验