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【单选题】
用与水平面成α角斜向上的拉力拉着质量为m的物体在水平面上运动,第一次在光滑水平面上,做匀加速直线运动,位移为x,做功w1;第二次在粗糙水平面上,做匀速直线运动,位移为x,作功w2,则( )A.
w1 > w2
B.
w1 < w2
C.
w1 = w2
D.
无法确定
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举一反三
【单选题】He was ______ that he couldn’t move.
A.
too cared
B.
so scared
C.
too scared
D.
so scaring
【单选题】Why did James Dean move back to Indiana when he was young?
A.
He lost his mother.
B.
He was unhappy in California.
C.
He missed his aunt.
D.
He had to attend school there.
【单选题】So _____ in the darkness that he didn't dare to move an inch.
A.
he was frightened
B.
was he frightened
C.
frightened he was
D.
frightened was he
【简答题】So _____ in the darkness that he didn't dare to move an inch. A、 he was frightened B、 was he frightened C、 frightened he was D、 frightened was he
【简答题】背景资料
某承包商承建某铁路工程项目，承包工作范围包括路基、桥涵工程。路基工程包括路堤和路堑工程，控制工程为某一特大桥，其为20×32m的简支箱梁，基础形式为明挖和钻孔桩。
问题 1.路堑工程施工安全控制应注意哪些问题? 2.针对此特大桥工程的施工方案的编制，主要考虑哪些因素? 3.在施工过程，施工单位为控制沉降、保证施工质量，采用扩大基础底面，开挖工程量增加导致费用增加4万元，相应工序持续时...
【单选题】When did Einstein's family move to Munich?
A.
When he was 2 years old.
B.
When he was 14 years old.
C.
When he finished his study.
D.
When he became a teacher.
【简答题】背景
某承包商承建某铁路工程项目，承包工作范围包括路基、桥涵工程。路基工程包括路堤和路堑工程，控制工程为某一特大桥，其为20×32m的简支箱梁，基础形式为明挖和钻孔桩。
问题 (1).路堑工程施工安全控制应注意哪些问题? (2).针对此特大桥工程的施工方案的编制，主要考虑哪些因素? (3).在施工过程，施工单位为控制沉降、保证施工质量，采用扩大基础底面，开挖工程量增加导致费用增加4万元，相应工...
【单选题】So _____ in the darkness that he didn ’ t dare to move an inch. A. he was frightened C. was he frightened B. frightened he was D. frightened was he
A.
he was frightened
B.
frightened he was
C.
was he frightened
D.
frightened was he
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