单项选择题
（）is the most liable to spontaneous combustion.
A.Cement
B.Chinaware
C.Fish meal
D.Steel products
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相关考题
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单项选择题
可用于测定寡聚蛋白质的分子量，而（）可用于测定寡聚蛋白质各个亚基的分（）子量。
A.SDS-聚丙烯酰胺凝胶电泳；核磁共振
B.聚丙烯酰胺凝胶电泳；凝胶过滤层析
C.凝胶过滤层析；等电聚焦电泳
D.凝胶过滤层析；SDS-聚丙烯酰胺凝胶电泳 -
单项选择题
You are about to enter a compartment to investigate a suspected smoldering fireIf youre not wearing a self-contained breathing apparatus, you should test the compartments atmosphere to determine if there is/are （）.
A.sufficient oxygen to sustain human life
B.an explosive mixture in the compartment
C.a toxic atmosphere in the compartment
D.All of the above -
问答题
什么是服务期望，包括哪几个种类？
