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【单选题】
Yesterday I went to buy a computer. There were so many models for us ________ in the shop that I was at a loss which to buy.A.
to be chosen
B.
to choose
C.
to choose from
D.
for choosing
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举一反三
【简答题】The three types of energies that make up the specific energy, e. include ______, and ______
【简答题】10.19是()类IP地址AA类BB类CC类DD类10.76.10.19是()类IP地址 AA类 BB类 CC类 DD类
【多选题】Basically, there are three types of computers, they are ___.
A.
mainframe. computer
B.
minicomputer
C.
microcomputer
D.
macrocomputer
【简答题】答案aa、bb、cc、dd
【简答题】已知共线点(AA′，BC)＝(BB′，CA)＝(CC′，AB)＝－1，求证：(AA′，B′C′)＝(BB′，C，A′)＝－1．
【简答题】如图,△ABC为正三角形,AA'∥BB'∥CC',CC'⊥平面ABC且3AA'= BB'=CC'=AB,则多面体ABC-A'B'C'的正视图是( )
【单选题】There are three types of volcanoes active volcanoes, dormant volcanoes and ______ volcanoes.
A.
extinguished
B.
extinct
C.
distinct
D.
instinctive
【简答题】如图，直线AA 1 ∥ BB 1 ∥ CC 1 ，如果 AB BC = 1 2 ，AA 1 =2，CC 1 =5，那么线段BB 1 的长是______．
【简答题】如图，A，B，C为不在同一条直线上的三点，AA′ ∥ BB′ ∥ CC′，且AA′=BB′=CC′，求证：平面ABC ∥ 平面A′B′C′．
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