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【简答题】
国际上通用的包装上的条形码有两种:一种是由美国、加拿大组织的统一编码委员会编制,其使用的物品标识符号为_______码;另一种是欧共体的欧洲物品编码协会编制,其使用的物品标识符号为_______码。
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【简答题】Today, bicycles are elegantly machines that are common around the world. Many people ride bicycles for recreation, whereas others use them as a means of transportation. The first bicycle was in...
【单选题】______ machines have multiplied over the centuries, even the most up-to-date list must begin with simple machines.
A.
While
B.
After
C.
As
D.
Since
【简答题】Inventions such as refrigerators and washing machines did much to _______ () home in the early 1900s.
【简答题】国际邮件按处理时限划分，可分为（）、（）、（）等几种。并在外表面注有专门标志。
【单选题】According to the text, simple machines can do the following but
A.
allow energy to be transferred from one place to another
B.
change the distance and speed of a moving object
C.
perform the task automatically
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