题目内容

39. What does the writer ask you to keep in mind when offering help to others?

A) Putting your own safety first.
B) Turning off all electric devices.
C) Giving as much help as you can.
D) Adopting simple measures if possible.

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A) whom to turn to during an emergency
B) how to act properly in an emergency
C)where to get emergency help
D) when to offer first-aid help

A. 血液
B. 红细胞
C. 纤维蛋白
D. 白血球

A. 连续流动式
B. 离心式
C. 分立式
D. 干化学式

A. 样本之间
B. 仪器之间
C. 试剂和样本之间
D. 试剂之间