问题
选择题
The roof fell before he had time to ________ the room to save his baby.[ ]
A．dash off
B．dash into
C．dash out
D．dash up
答案
答案：B
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The roof fell before he had time to ________ the room to save his baby.[ ]
A．dash off
B．dash into
C．dash out
D．dash up
答案：B
下表列出了1cm3活性炭所能吸收的常见气体的体积．试分析活性炭吸附气体的体积跟哪些因素有关？什么样的气体易被活性炭吸附？
| H2 | NO2 | CO2 | O2 | N2 | Cl2 | |
| 气体沸点/℃ | -252 | -33 | -78 | -183 | -196 | -34 |
| 吸附气体体积/mL | 4.5 | 178 | 97 | 35 | 11 | 494 |