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【单选题】
You can never imagine the difficulty I have _____ your house. [ ]A.
find
B.
to find
C.
finding
D.
found
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反馈参考答案：
举一反三
【单选题】预应力钢筋的张拉控制应力 是指 。
A.
扣除第一批預应力损失后的钢筋应力
B.
扣除全部预应力损失后的钥筋应力
C.
张拉预应力钢筋时,张拉机其所指示的总张拉力除以预应力钢筋面积的值
D.
固定预应力锅筋后的锅筋应力值
【单选题】______is the largest single employer of labor in the U. K.
A.
The central government
B.
The National Health Service
C.
The Civil Service
D.
The Police Service
【单选题】预应力钢筋的张拉控制应力δCon是指 。
A.
扣除第一批預应力损失后的钢筋应力
B.
扣除全部预应力损失后的钥筋应力
C.
张拉预应力钢筋时,张拉机其所指示的总张拉力除以预应力钢筋面积的值
D.
固定预应力锅筋后的锅筋应力值
【单选题】In order to release CO2 to the machinery spaces from a fixed fire extinguishing system, you must_____.
A.
actuate an alarm and open the engine room control valve
B.
actuate an alarm and open the engine room CO2 releasing valve
C.
open the engine room control valve and shut off engine room ventilation fans
D.
open the engine room control valve and then the CO2 releasing valve
【单选题】预应力钢筋的张拉控制应力 是指( )。
A.
扣除第一批预应力损失后的钢筋应力
B.
扣除全部预应力损失后的钢筋应力
C.
预应力钢筋在进行张拉时，张拉设备（千斤顶油压表）所指示的总张拉力除以预应力钢筋截面面积而得到的应力值。
D.
固定预应力钢筋后的钢筋应力值。
【单选题】It was ____ exciting news that more than ten students in a single school were admitted to Tsinghua University in the same year. [ ]
A.
one
B.
an
C.
/
D.
a
【单选题】Hip replacement surgery is______joint replacement surgery in the U. S.
A.
the single most frequent
B.
the most single frequent
C.
the single frequent
D.
a single frequent
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