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问题 选择题

常温下，将等物质的量浓度、等体积的烧碱溶液和乙酸溶液混合，充分反应后溶

液的pH

A．小于7

B．大于7

C．等于7

D．无法判断

答案

答案：B

正确答案B，产物为CH3COONa,水解后溶液呈碱性。

单项选择题

“Cost，Insurance and Freight”means that the seller delivers when the goods pass (1) in the port of shipment．The seller must pay the costs and (2) necessary to bring the goods to the named port of destination．But the risks of loss of or damage to the goods，as well as any additional costs due to events occurring after the time of delivery，are transferred from the seller to the buyer．However，in CIFthe (3) also has to procure insurance against the buyer’s risk of loss of or damage to the goods during the carriage．Consequently，the seller contracts for insurance and pays the (5) ．The CIF term requires the seller to (5) the goods for export．

A．the ship’s rail

B．carrier

C．board

D．carriage
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单项选择题

二进制数1111011111转换成十进制数为( )。

A．990

B．899

C．995

D．991
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