问题
选择题
There ________ some milk, two eggs and a few cakes on the table. [ ]
A. is
B. are
C. has
D. have
答案
答案：A
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There ________ some milk, two eggs and a few cakes on the table. [ ]
A. is
B. are
C. has
D. have
答案：A
A2O4(g)；△H＜0。在恒温恒容条件下，将一定量AO2和A2O4的混合气体通入容积为2L的密闭容器中，反应过程中各物质的物质的量浓度c随时间t的变化关系如下图所示。 