题目内容

Nowadays, our heroes are ____men and women.

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Besides, first ____, whose duty is to rush toward danger, are also heroes, even when their efforts failed to bring about desirable effects.

The stories of heroes help remind us that ordinary people can do ____things.

Text A is a Question-- ____--Conclusion Pattern.

提高仪器性能的关键是（）

A. 提高仪器自动化程度
B. 降低仪器噪声
C. 提高仪器的灵敏度
D. 提高仪器的信噪比