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【多选题】
以下关于SDH信号帧结构的描述正确的是：（）
A.
SDH帧为块状矩形帧结构
B.
SDH帧为条状线形帧结构
C.
SDH帧在传送时是一行接着一行传送的
D.
不同SDH信号帧的行数不变，始终为9行
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倾斜方向相同且间隔相同
B.
倾斜方向相反
C.
采用粗实线
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【单选题】According to the section "Lego Is Looking For Other Materials To Use," why has it been hard for Lego to replace plastic with a new material?
A.
because it is hard to find a material as strong as plastic
B.
because it is hard to find a material as cheap as plastic
C.
because it is hard to find a material as safe as plastic
D.
because it is hard to find a material as colorful as plastic
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用来充电。
B.
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D.
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【单选题】蓄电池在汽车上的主要作用是( )。
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B.
用来吸收发电机的过电压，保护电子元件
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【单选题】A ball of clay falls freely to the hard floor. It does not bounce noticeably, and it very quickly comes to rest. What, then, has happened to the energy the ball had while it was falling?It has been us...
A.
It has been used up in producing the downward motion.
B.
It has been transformed back into potential energy.
C.
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D.
It is in the ball and floor (and walls) as energy of invisible molecular motion.
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【单选题】People found it hard to so much advertising in TV series that a rule has been made to ban it. [     ]
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【单选题】装配图中,相邻两个金属零件画剖面线时应( )。
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倾斜方向相同且间隔相向,
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【单选题】One feels it hard to fit in with a new culture _______ he has been accustomed to his won culture.
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the moment
B.
which
C.
now that
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as
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【单选题】装配图中,相邻两个金属零件,画剖面线时应
A.
倾斜方向相同且间隔相同
B.
倾斜方向相反
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【单选题】According to the section "Lego Is Looking For Other Materials To Use," why has it been hard for Lego to replace plastic with a new material?
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【单选题】蓄电池在汽车上的主要作用是( )。
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【单选题】蓄电池在汽车上的主要作用是( )。
A.
用来充电
B.
用来吸收发电机的过电压，保护电子元件
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用来给起动机供电，起动发动机
D.
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【简答题】It has been hard to adjust _____ the idea of being a junior clerk, but now I enjoy it.
查看完整题目与答案
【简答题】B. Rewrite the following sentences, using the –ing participle “being”. (用 being 分词短语,来改写下列各句。) 1. It has been hard to adjust to the idea that I was a junior clerk. 2. His illness accounted for (解释) th...
查看完整题目与答案
【单选题】A ball of clay falls freely to the hard floor. It does not bounce noticeably, and it very quickly comes to rest. What, then, has happened to the energy the ball had while it was falling?It has been us...
A.
It has been used up in producing the downward motion.
B.
It has been transformed back into potential energy.
C.
It has been transferred into the ball by heat.
D.
It is in the ball and floor (and walls) as energy of invisible molecular motion.
查看完整题目与答案
【单选题】People found it hard to so much advertising in TV series that a rule has been made to ban it. [     ]
A.
catch up with
B.
put up with
C.
get along with
D.
get away with
查看完整题目与答案
【单选题】装配图中,相邻两个金属零件画剖面线时应( )。
A.
倾斜方向相同且间隔相向,
B.
倾斜方向相反
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采用粗实线
D.
采用虚线
查看完整题目与答案
【单选题】One feels it hard to fit in with a new culture _______ he has been accustomed to his won culture.
A.
the moment
B.
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C.
now that
D.
as
查看完整题目与答案