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【简答题】
n个顶点的强连通图至少有( )条边,其形状是( )。A n B n+1 C n-1 D n×(n-1)E 无回路 F 有回路 G 环状 H 树状
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【简答题】（12分）【化学—化学与技术】 硫酸是工业生产中最为重要的产品之一，在化学工业的很多领域都要用到浓硫酸。 （1）在硫酸工业生产中，我国采用黄铁矿为原料生产SO 2 ，反应的化学方程式为 ，该反应在 中进行（填设备名称）。 （2）为了有利于SO 2 转化为SO 3 ，且能充分利用热能，采用了多层催化剂且有热交换器的 （填设备名称）中进行反应。在如图所示的装置中，C处流出的气体有 ；SO 3 进入 （...
【简答题】Steven Jobs was born in 1955. He was an American businessman and inventor. He was the co-founder and chief executive officer (CEO) of Apple Inc. In the late 1970s, Steve, with Apple co-founder Steve W...
【简答题】Steven Jobs was born in 1955. He was an American businessman and inventor. He was the co-founder and chief executive officer (CEO) of Apple Inc. In the late 1970s, Steve, with Apple co-founder Steve W...
【简答题】随着发动机技术的发展,现在轿车进气控制系统主要包括 控制系统、 控制系统、 控制系统、 控制 系统。
【单选题】When the fire started, Tom was to help all the children out. He is both brave and smart.A．too ca
A.
When the fire started, Tom was ____ to help all the children out. He is both brave and smart. A．too calm
B.
calm enough
C.
too nervous
D.
nervous enough
【单选题】
A.
He was brave enough to admit his mistakes.
B.
He was never satisfied with the material for light bulb.
C.
He thought failure is simply a step toward success.
D.
He had many good qualities that other people don't have.
【单选题】An Indian's name told the world what he was—a coward, a liar, a thief, or a brave. When I was young, every Indian had at least three names during his lifetime. His first name was given to him at birth...
A.
described the character of a man
B.
described the appearance of a man
C.
were never used by other people
D.
told us his profession
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