ORDER FORM
Information of Customer
Name: Mary Susan from DHA Industries
Address: No. 21 (1)______Street
Contact No. : (2)______
Information of Computers
Type: R51 models (3)______on hard drive
Quantity: (4)______
Delivery Date: Friday morning

4（）

A．the production efficiency has greatly been improved by the "American System".
B．many other machines such as refrigerators, washing machines and vacuum cleaners are produced on the assembly line.
C．with the interchangeable parts, American industries advanced greatly.
D．the industrial managers began the careful study of the operations with the aim of reducing the methods.