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【单选题】
以甲基橙为指示剂,能用NaOH标准溶液直接滴定的酸和能用HCL标准溶液直接滴定的碱分别是( )A.
H 2 C 2 O 4 ,C 2 O 4 2-
B.
H 3 PO 4 ,PO 4 3-
C.
HAC,AC -
D.
HCOOH,HCOO -
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皮皮学刷刷变学霸
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【多选题】关于数据库设计步骤的说法中正确的有
A.
物理设计阶段需要对时间、空间效率、维护代价和各种用户要求进行权衡
B.
概念结构设计是在逻辑设计的基础之上进行的
C.
将ER图转化为关系模型阶段属于逻辑结构设计
D.
数据库的试运行属于数据库实施阶段的任务
【单选题】We don’t consider ___ necessary for them to move into that house.
A.
that
B.
This
C.
it
D.
them
【单选题】听力原文：W: Did you see my book? It's not on the shelf, nor on my desk. M: Why don't you look under your chair? That's where I saw it a little while ago. Maybe it just fell when you went to the kitchen. W...
A.
On the desk.
B.
Under the chair.
C.
On the shelf.
【单选题】----- Did you go to see the football match in the stadium ? ----- _____, but my brother called on me.
A.
I’d like to
B.
I’d like to have
C.
I wouldn’t like it
D.
I like to
【单选题】— ______ my pen? — Yes, I have. I saw it on your desk a moment ago. [ ]
A.
Do you see
B.
Did you see
C.
Would you see
D.
Have you seen
【单选题】We don' t consider______necessary for them to move into that house.
A.
that
B.
this
C.
it
D.
them
【单选题】下列选项中,哪一个是不需要确认合同收入的( )。
A.
合同实际的成本不能可靠的计量
B.
合同完工进度和为完成合同尚需发生的成本能可靠计量。
C.
与合同相关的经济利益很可能流入企业
D.
合同总收入能够可靠计量
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【单选题】We don’t consider ___ necessary for them to move into that house.
A.
that
B.
This
C.
it
D.
them