未知题型 What is the 'main question for the poor' (Line 1, Paragraph 2) according to the passage?A.The poor are not the master of themselves.B.The poor fail to see the real power of the operation of capital.C.The poor do not understand that they are buying things they do not neeD.D.The laborers are always deceived by the rich who pretend to be benefactors.

未知题型 Compared to the yearly price changes that actually occurred on foreign agricultural markets during the 1880's American farmers would have most preferred yearly price changes that wereA.similar in size but in the opposite direction.B.much smaller and in the same direction.C.much smaller but in the opposite direction.D.slightly greater and in the same direction.

单项选择题 在书中叉车工作装置液压传动系统中，（  ）可防止重载缸逆行、轻载缸超速的现象发生。  A、单向节流阀中的单向阀 B、手动换向阀中的单向阀 C、溢流阀 D、限速阀