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【单选题】
信号传送的距离越远,时延就越大的是( )。A.
传播时延
B.
传输时延
C.
处理时延
D.
排队时延
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举一反三
【单选题】She used to ______ a bike to school, but now she is used to ______ to school. A. ride; walk B. riding; walking C. ride; walking
A.
ride; walk
B.
riding; walking
C.
ride; walking
【简答题】C'est l'anniversaire de Marie, -vous allés acheter un cadeau ?
【单选题】NaOH 溶液标签上标示的浓度为0.300mol/L,该溶液从空气中吸收了少量的CO2 ,现以酚酞为指示剂,用标准HCl溶液标定,标定结果比标签上标示的浓度( )。
A.
高
B.
低
C.
不变
D.
无法确定
【单选题】What can be inferred about the woman whe she says this?
A.
She believes that there is no way to confirm that information.
B.
She is concerned about information security.
C.
She doubts the accuracy of the information.
D.
She does not find the information helpful.
【单选题】Multimodal transport refers to a transport system usually operated by a carrier with more than one mode of transport under the control or ownership of one operator. ( )
A.
正确
B.
错误
【简答题】Multimodal transport is obviously（ ）than segmented transport．
【单选题】Multimodal transport is a transport system for carriage of goods by at least ( ) different modes of transport.
A.
two
B.
one
C.
three
D.
four
【单选题】铁盐检查时,需加入过硫酸铵固体适量的目的在于
A.
消除干扰
B.
加速Fe3+和SCN的反应速度
C.
增加颜色深度
D.
将低价态铁离子(Fe2+)氧化为高价态铁离子(Fe3+),同时防止硫氰酸铁在光线作用下,发生还原或分解反应而褪色
E.
将高价态铁离子(Fe3+)还原为低价态铁离子(Fe2+)
【单选题】如在乙醇溶液的瓶标签上写的浓度为“10→100”则表示( )。
A.
10ml乙醇加入100ml水;
B.
将10ml乙醇加水稀释到100ml;
C.
100ml乙醇加10ml水;
D.
10ml乙醇加90ml水;
E.
90ml乙醇加10ml水
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