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解方程： x 2 +2x-2= 8 x 2 +2x ．
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举一反三
【单选题】He was usually very kind so that his sudden _________ greatly surprised us.
A.
shrewdness
B.
optimism
C.
harshness
D.
uprightness
【简答题】● For （71） service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new （72） for every packet sent. Instead, when a connect...
【单选题】—This suitcase is really heavy, and my back is giving me a lot of trouble! —_____ —That's very kind of you. [ ]
A.
You're welcome.
B.
Never mind.
C.
Certainly.
D.
Shall I carry it?
【单选题】For (71) service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new (72) for every packet sent. Instead, when a connectio...
A.
connectionless
B.
connection-oriented
C.
datagram
D.
telegram
【单选题】Historians can't tell us when, where or 【71】 the first food was cooked. In earliest 【72】 when people had eaten their food 【73】 , an fire was used only to provide heat and light. The first primitive co...
A.
who
B.
which
C.
how
D.
what
【单选题】—Pandas are very beautiful, _______ kind of shy. Do you think so? —Sure. And they are the treasure of our country.
A.
and
B.
so
C.
but
D.
or
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