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【简答题】
某溶液中只含有Na 2 SO 4 、Na 2 CO 3 和NaCl三种溶质．欲证明其中SO 4 2- 、CO 3 2- 、Cl - 确实存在，我们设计了如下实验，请你认真填写下面的实验报告． 表 实验步骤 实验现象 结论 1．该溶液的试管中加入足量稀HNO 3 有气泡产生 证明有CO 3 2- 2．继续向试管中加足量______溶液 有白色沉淀生成 证明有______ 3．过滤，向滤液中加适量______溶液 有白色沉淀生成 证明有______
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【单选题】单杠杆差压变送器主杠杆的作用是( )。 1信号号放大作用;2信号比较作用;3信号转换作用;4信号测量作用;5反馈作用。
A.
①②③④
B.
①②③⑤
C.
①②③
D.
②③⑤
【多选题】On February 2, Company A made a selling offer to Company B, "We offer firm at USD 150 per carton FOB Shanghai, subject to your reply here on or before February 10." On February 6, B replied, "Your off...
A.
B's reply on February 6 is an acceptance.
B.
B's reply on February 6 is a counteroffer.
C.
B's mail on February 8 is an acceptance.
D.
B's mail on February 8 is a new offer.
E.
A contract was concluded between A and B.
F.
No contract was concluded between A and B.
G.
B's reply on February 6 is a new offer.
【简答题】一个触发器有 个稳态,存储4位二进制信息要 个触发器。
【多选题】On February 2, Company A made a selling offer to Company B, "We offer firm at USD 150 per carton FOB Shanghai, subject to your reply here on or before February 10." On February 6, B replied, "Your off...
A.
B's reply on February 6 is an acceptance.
B.
B's reply on February 6 is a counteroffer.
C.
B's mail on February 8 is an acceptance.
D.
B's mail on February 8 is a new offer.
E.
A contract was concluded between A and B.
F.
No contract was concluded between A and B.
【简答题】触发器有 个稳态,存储 4 位二进制信息要 个触发器。
【单选题】单杠杆差压变送器主杠杆的作用是( )。1信号放大作用;2信号比较作用;3信号转换作用;4信号测量作用;5反馈作用。
A.
①②③④
B.
①②③⑤
C.
①②③
D.
②③⑤
【多选题】On February 2, Company A made a selling offer to Company B, "We offer firm at USD 150 per carton FOB Shanghai, subject to your reply here on or before February 10." On February 6, B replied, "Your off...
A.
B’s reply on February 6 is a counteroffer.
B.
B’s mail on February 8 is a new offer.
C.
No contract was concluded between A and B.
D.
B’s reply on February 6 is an acceptance.
E.
B’s mail on February 8 is an acceptance.
F.
A contract was concluded between A and B.
【简答题】An 80-year-old man was sitting in his house beside his 45-year-old son. Suddenly a crow(乌鸦) landed in front of the window. The father ___21___ son, 'What is that?' The son replied, 'It is a crow.' ___...
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