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标定HCl溶液时，以Na2CO3为基准物，称取Na2CO30.5135g，经水溶解后，用甲基橙为指示剂，滴定时消耗HCl 21.50cm3，
标定HCl溶液时，以Na2CO3为基准物，称取Na2CO30.5135g，经水溶解后，用甲基橙为指示剂，滴定时消耗HCl 21.50cm3，求该HCl溶液的浓度及对CaCO3的滴定度。
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第2题
We are not in a position of placing an order with you for the table-cloths at the pric
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A.of placing
B.table-cloths
C.at
D.offered
第3题
Even if the buyer uses an official order form. when placing an order, he should send
a covering letter confirming terms of payment, discounts, delivery and packing.()
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第4题
Before placing a finn order,we should be glad if you would send us your products on 15 days'appr
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第5题
When placing an order for the garments, please _____ the color besides the sizes and the styles.
A．write
B．tell
C．say
D．indicate
第6题
PB Co uses 2,500 units of component X per year. The company has calculated that the cost o
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第7题
（)？ It includes merchandise, packaging and shipping, duty if required, any taxes and i
()？
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A、 Could I get an estimate before placing an order
B、 What does the estimate include
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第8题
The principle of “Unreservedness” observed in writing a letter for placing an order requires the writer to ____.
A、write the letter short but complete, telling the seller what you want directly without any ambiguity
B、list all the terms and conditions necessary for the acceptance of the order without any reservation
C、show his pleasure for the business and confirm the order
D、agree upon all the terms and conditions of the transaction
第9题
听力原文：（A) She's putting the menu down on the table.（B) She's giving her order to the wa
听力原文：(A) She's putting the menu down on the table.
(B) She's giving her order to the waiter.
(C) She's looking over the menu.
(D) She's placing her order online.
A．
B．
C．
D．
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