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【多选题】
下列哪些属于碱性物质A.
草酸盐
B.
柠檬酸盐
C.
NH ₃
D.
NH4 +
E.
苹果酸盐
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举一反三
【单选题】Which of the following statements about the 55 men framing the Constitution is true?
A.
Thomas Jefferson was not among them.
B.
All of them were famous.
C.
All of them contributed much to the framing
D.
George Washington and Benjamin Franklin were among them.
【单选题】Every year lots of trees _______ to make our country more beautiful.
A.
is planted
B.
was planted
C.
are planted
D.
were planted
【单选题】关于Midas软件中“定义施工阶段”对话框中“激活数据”和“钝化数据”代表的含义，以下说法正确的是()。
A.
“激活数据”表示使单元参与计算，常用于模拟支护过程;“钝化数据”表示使单元不参与计算，常用于模拟开挖过程。
B.
“激活数据”表示使单元参与计算，常用于模拟开挖过程;“钝化数据”表示使单元不参与计算，常用于模拟支护过程。
C.
“激活数据”表示使单元不参与计算，常用于模拟支护过程;“钝化数据”表示使单元参与计算，常用于模拟开挖过程。
D.
“激活数据”表示使单元不参与计算，常用于模拟开挖过程;“钝化数据”表示使单元参与计算，常用于模拟支护过程。
【简答题】世界上公认的第一台计算机的名称
【简答题】短文填词。根据首字母提示，完成短文。 Have you ever p 1 a few trees on Tree Planting Day? Each year, millions of people, both old and young, men and women, plant a lot of trees. But this may not be the best way to make ...
【单选题】Many trees _______ on the hills last year. And we will plant more this year.
A.
plant
B.
planted
C.
are planted
D.
were planted
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