问题
单项选择题
病室内进行臭氧空气消毒时，要求臭氧浓度（）
A.≥50mg/m3
B.≥20mg/m3
C.≥10mg/m3
D.≤20mg/m3
E.≤1mg/m3
答案
参考答案：B
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病室内进行臭氧空气消毒时，要求臭氧浓度（）
A.≥50mg/m3
B.≥20mg/m3
C.≥10mg/m3
D.≤20mg/m3
E.≤1mg/m3
参考答案：B
In a small village, there lived a potter(陶工) who had a donkey. Every day his donkey would carry soil from the ______ to his house. Since the field was quite far off, the potter would ______ under a tree midway, tying(拴) his donkey nearby. One day, the potter ____ to take the rope with which he tied the donkey every day. When he reached the ____, he became worried and didn’t know what to do. At that time, a saint(圣人) ____ to be passing by. When the potter told the saint what his ____ was, he said, “Take the ____ to the place where you tie him every day. ____ to tie him using an imaginary rope. He won’t run away.” The potter did what the saint had said. When he woke up, to his ___ and relief, he found the donkey standing in the ____ place. But to his frustration, when he prepared to leave for ____, the donkey did not move. ____, the potter saw the wise saint again and told him about the donkey’s ____ behavior. The saint said, “Go and pretend to untie the rope.” The potter ____ the saint’s advice. Now the donkey was ready to leave for home. The potter thanked the wise saint and went home ____ his donkey.
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