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【简答题】
如图，若∠AED=∠B，求证：AD·AB=AE·AC。
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举一反三
【单选题】阅读下文，回答题 On November 19, 1863, Abraham Lincoln went to Gettysburg in Pennsylvania to speak at the National Soldiers Cemetery. The Civil War was still going on. There was much criticism of Presi-dent L...
A.
very critical
B.
unpopular
C.
very popular
D.
very courteous
【单选题】阅读下文，回答题 Trees are useful to man in three important ways: they provide him with wood and other prod-ucts; they give him shade; and they help to prevent droughts and floods. Unfortunately, in many part...
A.
They help him make money
B.
They give him wood and other products
C.
They help him prevent droughts and floods
D.
They give him shade
【单选题】子网掩码不能单独存在，它必须结合IP地址一起使用。子网掩码只有一个作用，就是将某个IP地址划分成_______和主机地址两部分。
A.
DNS
B.
IP地址
C.
网络地址
D.
网关
【单选题】阅读下文，回答题 All the useful energy at the surface of the earth comes from the activity of the sun. The sun heats and feeds creatures and mankind. Each year it provides men with two hundred million tons of...
A.
gasoline
B.
natural gas
C.
atomic power
D.
animal fat
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