【单选题】王长喜标准听力二Section B 31 Passage Two Questions 30 to 32
【单选题】处于甾环平面下方的原子或基团称 α- 构型用
【简答题】低合金钢与奥氏体不锈钢焊接时,焊缝中成分上的过渡变化区是因熔池凝固特性造成的,固称为凝固过渡层;其特性是高硬度的______ 。
【单选题】王长喜标准听力二Section B 32 Passage Two Questions 30 to 32
A.
To make it easy to enjoy the beautiful scene of the sea.
B.
To show China’s growing economic power.
C.
To help develop economy.
【单选题】王长喜标准听力二Section B 30 Passage Two Questions 30 to 32
A.
To tell us how much time the new bridge will spend.
B.
To tell us how much money the new bridge will cost.
C.
To tell us China has started to build the longest bridge across the sea in the world.
D.
To tell us why China began to build the longest bridge across the sea in the world.
【判断题】一般将各种防腐剂分成三种类型,即酸性防腐剂、酯型防腐剂、生物防腐剂。A. 对 B. 错