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测定人造板及其制品中甲醛使用穿孔萃取仪，对其进行校验的操作包括：采用套式恒温器加热烧瓶，将500ml（）加入1000m1标准磨口圆底烧瓶中，另将100ml（）及1000m1（）加入萃取管内，然后开始蒸馏。
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举一反三
【单选题】Americans seem to be cooling toward global warming. Just 57 percent think there is solid evidence the world is getting warmer, down 20 points in just three years, a new poll says. And the share of peo...
A.
Collecting the evidence of climate change.
B.
Taking action to limit emissions which absorb heat.
C.
Recording the highest temperature in a year.
D.
Negotiating a new treaty for reducing the emissions.
【单选题】定影单元中的恒温器作用是（）
A.
温度失控时的过热保护
B.
定影热辊温度的探测传感器
C.
定影灯的过载保护
D.
热辊的温度稳定器
【单选题】机械式恒温器的毛细管泄漏，空调压缩机会发生下列哪种现象（）
A.
立即停转
B.
电磁离合器一直吸合
C.
立即烧毁
D.
吸气压力过高
【单选题】Questions are based on the following passage. Americans seem to be cooling toward global warming. Just 57 percent think there is sol-id evidence the world is getting warmer， down 20 points in just thr...
A.
plunged into danger
B.
been enjoyed
C.
undergone a decline
D.
been drowned
相关题目：
【单选题】Americans seem to be cooling toward global warming. Just 57 percent think there is solid evidence the world is getting warmer, down 20 points in just three years, a new poll says. And the share of peo...
A.
Collecting the evidence of climate change.
B.
Taking action to limit emissions which absorb heat.
C.
Recording the highest temperature in a year.
D.
Negotiating a new treaty for reducing the emissions.
【单选题】定影单元中的恒温器作用是（）
A.
温度失控时的过热保护
B.
定影热辊温度的探测传感器
C.
定影灯的过载保护
D.
热辊的温度稳定器
【单选题】机械式恒温器的毛细管泄漏，空调压缩机会发生下列哪种现象（）
A.
立即停转
B.
电磁离合器一直吸合
C.
立即烧毁
D.
吸气压力过高
【单选题】Questions are based on the following passage. Americans seem to be cooling toward global warming. Just 57 percent think there is sol-id evidence the world is getting warmer， down 20 points in just thr...
A.
plunged into danger
B.
been enjoyed
C.
undergone a decline
D.
been drowned
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