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，

e you offered.()

A.of placing

B.table-cloths

C.at

D.offered

a covering letter confirming terms of payment, discounts, delivery and packing.()

oval.

A．write

B．tell

C．say

D．indicate

f placing and processing a purchase order for component X is $185, and the cost of holding one unit of component X for a year is $25. the economic order quantity (EOQ) for component X is

()？

It includes merchandise, packaging and shipping, duty if required, any taxes and insurance.

A、 Could I get an estimate before placing an order

B、 What does the estimate include

C、 How many would you like to order

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

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．