石油井场用的柴油机多数采用（）曲轴箱。
A.底座式
B.悬挂式
C.隧道式
D.组合式
参考答案：B
— Hangzhou Bay Bridge between Ningbo and Jiaxing is about 36 kilometers long.
— Wow. _____! [ ]
A. What a big city
B. What a long bridge
C. How beautiful the cities are
D. How long the river is
工业却水用量占工业用水总量的( )左右。
A．90% B．20% C．50% D．80%
