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【单选题】
下列情景中,重力对小球做功的是(  )
A.
小球在地面上静止
B.
小球由高处下落
C.
小球沿水平轨道运动
D.
小球悬挂在天花板上不动
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参考答案:
举一反三
【多选题】下列哪些阀门安装有方向要求
A.
截止阀
B.
闸阀
C.
止回阀
D.
旋塞阀
【单选题】当理想空载转速n0相同时,闭环系统的静差率Sop与开环下的Scl之比为( )。
A.
1
B.
0  (K为开环放大倍数)
C.
1+K
D.
1/(1+K)
【单选题】The pencil ___she is drawing is his.
A.
with which
B.
in which
C.
on which
D.
by which
【单选题】教师焦虑的成因是()。①教师的收入低②教师的心理特点③工作量太大、学生难教育、升学压力大④教师之间竞争激烈
A.
①②③④
B.
①②③
C.
②③
D.
【单选题】当理想空载转速n0相同时,闭环系统的静差率与开环下的之比为( )
A.
1
B.
0 (K为开环放大倍数)
C.
1+K
D.
1/(1+K)
【单选题】The pencil ______she is writing is mine.
A.
with which
B.
in which
C.
on which
D.
by which
【单选题】Read the paragraph from the section "Sara Is Careful With Her Pencil." To write, Sara holds her pencil between her arms. She looks at the letter shapes. Then she carefully draws each point and curve. ...
A.
the prize that Sa ra will ge t
B.
the way that Sara writes
C.
the contest that Sara won
D.
the school that Sara goes to
【简答题】What did the woman mean? [A] She could offer him a pencil. [B] She had no pen herself. [C] She could let the man have her pen.
【单选题】当理想空载转速n0相同时,闭环系统的调速范围D与开环下的D之比为( )。
A.
1
B.
0
C.
1+K
D.
1/(1+K) (K为开环放大倍数)
【简答题】根据下列材料,请回答5~8题:某施工单位中标中型炼钢厂的连铸安装工程项目。施工单位及时组建了项目部,项目部在组织施工过程中有以下情况。 情况一:项目部按工业安装工程质量验评项目划分规定对安装工程项目进行了划分,其中有连铸安装工程、机械设备安装工程、蒸汽排风机安装工程、电气安装工程、自动化仪表安装工程等。 情况二:技术人员对班组进行施工方案交底的主要内容是该工程的安装工程量、工程规模及现场的环境状况...
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