传动轴中间支承轴承支架的固定螺栓松动会造成（）。
参考答案：传动轴连续震响
Traveling to space is no longer just a dream.
Russia ______ the first hotel in space in the near future. [ ]
A. builds
B. will build
C. built
D. has built
闪点大于等于（）度的液体是丙类火灾危险物质。
A.10
B.28
C.48
D.60
