输油臂的动作缓慢原因之一是()。
A、臂中有液体
B、转子损坏
C、液压系统进气或泄漏
D、滚珠轴承磨损
参考答案:C
如图所示的电、磁现象中,正确的是
The tourists often complained of being _____ by the local peddlers when they buy some souvenirs.
A.ripped off
B.ripped out
C.ripped up
D.ripped way