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【单选题】
设常数 ,则级数 ( )A.
绝对收敛
B.
条件收敛
C.
发散
D.
敛散性与常数k取值有关
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举一反三
【单选题】According to the passage, why did steel replace iron in the construction of skyscrapers?
A.
Steel is stronger than iron and resists fatigue better.
B.
Steel allows architects more freedom of expression.
C.
Steel is more available and less expensive than iron.
D.
Steel does not rust, so it lasts longer than iron does.
【单选题】when a bar of iron attracts other pieces of iron，it ____a magnet，and thus the attraction is called mangnetism.
A.
will be acted as
B.
acts as
C.
is acted as
D.
has been acted as
【简答题】An iron bar is to be electroplated with zinc. ·Identify what will act as the two electrodes for the cell ·Identify each electrode as either the anode or cathode ·Write the half- reactions occurring at...
【单选题】Why did Sturgeon's electromagnet could support nine pounds of iron?
A.
Because the iron rod was bent into the shape of a “horseshoe”.
B.
Because the rod was coated with varnish.
C.
Because a layer of copper wire was wrapped around the rod.
D.
Because the rod was made magnetic by the passing current.
【单选题】What did the Dragon King plan to do after Wukong took away the iron bar away?
A.
Trace him.
B.
Fight with Wukong.
C.
Report to the Jade Emperor.
D.
Kill Wukong.
【单选题】李先生,29岁。股骨干骨折,入院后行小夹板固定、骨牵引治疗。护理注意点中,错误的一项是( )
A.
应将床头抬高15～30cm
B.
牵引绳不可受压
C.
牵引重量不可随意增减
D.
牵引力与反牵引力应保持在一条线上
E.
牵引肢体的足部不能抵住床栏
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