发动机正常工作时,机油压力应保持在()范围内。
A.0.1~0.2MPa
B.0.2~0.4MPa
C.0.3~0.6MPa
D.0.4~1.0MPa
参考答案:B
It is reported that the Underground Line No. 8 _____ in our city in 2010. [ ]
A. will be built
B. has built
C. will built
D. has been built
轴瓦和轴承衬的材料统称为轴承材料。