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【单选题】
根据酸碱质子理论,对于反应 NaH 2 PO 4 +NaHSO 4 =H 3 PO 4 +Na 2 SO 4 来说,下列各组物质都是酸的是() 。A.
NaH 2 PO 4 和 NaHSO 4
B.
H 3 PO 4 和 Na 2 SO 4
C.
NaHSO 4 和 H 3 PO 4
D.
Na 2 HPO 4 和 Na 2 SO 4
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举一反三
【单选题】Upon arrival, the pioneers who settled a new area of the frontier would eat which of the following?
A.
Corn, cattle, arid pigs.
B.
Indian maize, native fruits, and wild meat.
C.
Preserved fruits, dried meats, and pine roots.
D.
Fresh food and native vegetables.
【单选题】Which of the following is true about Li’s new “green” concrete?
A.
The new concrete will greatly reduce the cost of production and construction.
B.
Traditional concrete is stronger, lighter and climate-friendly compared with new concrete.
C.
Traditional concrete grants more freedom in design and construction compared with new concrete.
D.
The new concrete requires no reinforcement in preparation.
【单选题】Upon arrival, the pioneers who settled a new area of the frontier would eat which of the following?
A.
Com, cattle and pigs.
B.
Indian maize, native fruits and wild meat.
C.
Preserved fruits, dried meats and pine roots.
D.
Fresh food and native vegetables.
【简答题】我国交流电的频率为 。
【单选题】Upon arrival, the pioneers who settled a new area of the frontier would eat which of the following?
A.
Corn, cattle, arid pigs.
B.
Fresh food and native vegetables.
C.
Indian maize, native fruits, and wild meat.
D.
Preserved fruits, dried meats, and pine roots.
【单选题】'Frontier', one of many English words that took on new meanings in North America, has assumed as well a role in explaining the continent's history during the past five hundred years. In time the word ...
A.
show his influence in American history studies
B.
indicate the complex nature of the term 'frontier'
C.
reveal the truth about American history
D.
stress the role of 'frontier' in the U.S. history
【单选题】The fact that______can be learned about the 'new frontier' in the text.
A.
Japan has been looking beyond the 'new frontier'
B.
it is filled up with corporate competitors
C.
it results in a major global revival recently
D.
Japanese firms are the latecomers in this area
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