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【多选题】
下列桥梁设计计算荷载中,属于偶然作用的有( )
A.
船舶的撞击作用
B.
汽车制动力
C.
汽车撞击作用
D.
地震作用
E.
冰压力(2016一建公路工程实务真题)
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【单选题】有关 Na 2 CO 3 和 NaHCO 3 性质的说法正确的是 ( )
A.
热稳定性: Na 2 CO 3 < NaHCO 3
B.
相同温度下,在水中的溶解度: Na 2 CO 3 < NaHCO 3
C.
Na 2 CO 3 溶液和 NaHCO 3 溶液可用氯化钡溶液鉴别
D.
NaHCO 3 溶液能与碱溶液反应而 Na 2 CO 3 溶液不能
【简答题】unit 1 page 7 passage
【单选题】Now children, turn to Page _____ and look at the _____ picture in Unit 1.
A.
Twentieth, one
B.
Twenty, one
C.
Twentieth, first
D.
Twenty, first
【单选题】UNIT 1 PAGE 10 PASSAGE 1.2
A.
B.
C.
D.
D
【单选题】UNIT 1 PAGE 10 PASSAGE 1.1
A.
B.
C.
D.
D
【单选题】What is the power source for arc welding?
A.
Welding machine
B.
electrode
C.
C
D.
D
【简答题】What is shielded metal arc welding?
【单选题】UNIT 1 PAGE 10 PASSAGE 1.3
A.
B.
C.
D.
D
【简答题】A: Could you introduce this welding equipment to me? B: Sure. The welding equipment is called a wire feeder . A: What are the main parts of it? B: The main parts of it are: handle , wire reel , wire d...
【单选题】What is the temperature in an electric arc welding?( )
A.
50-60°C
B.
500-600°C
C.
5000-6000°C
D.
None of the above