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【判断题】
锅炉、压力容器破裂的发源地往往是在结构的应力集中、局部应力和拉伸残余应力较高及存在缺陷的焊接接头区（）A.
正确
B.
错误
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【单选题】When we arrived at the railway station, they were ____ there.
A.
yet
B.
once
C.
already
【单选题】在一定体积的密闭容器中放入3L气体R和5L气体Q，在一定条件下发生反应：2R（气）＋5Q（气） 4X（气）＋nY（气），反应完全后，容器温度不变，混合气体的压强是原来的87.5％，则化学方程式中n值是
A.
2
B.
3
C.
4
D.
5
【单选题】反应2R(气) + 5Q(气)=4X(气) + 2Y(气) 在2L的密闭容器中进行,20s后,R减少了0.04mol,则该反应的平均速率是
A.
VR＝0.08mol·L-1·min-1
B.
VQ＝0.05mol·L-1·min-1
C.
VX＝0.12mol·L-1·min-1
D.
VY＝0.12mol·L-1·min-1
【简答题】Fill in the blanks with the following words and phrases. title / reduces / cycle / eliminates / process / software / bill of lading / documents / approach / electronic delivery The Bill of Lading __1_...
【单选题】Choose the best answer to complete each of the sentences. It was already 11 o'clock in the evening ______ they arrived at the hotel.
A.
when
B.
while
C.
once
D.
since
【单选题】It was already 11 o'clock in the evening ______ they arrived at the hotel.
A.
when
B.
while
C.
once
D.
since
【简答题】Complete the following passage with the words in the box. Each can be used only once. A. moved B. the other C. another D. tired E. because Once, a king had a new road built. The king ha...
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