活塞式制冷压缩机的润滑除了采用油泵供油外,还有()形式。
参考答案:曲轴甩油
The purpose of technology is to make it easier ,______ it more difficult.
A.not make
B.making not
C.not to make
D.do not make
四年级共有学生240人,每人交101元书费,一共能收多少元书费?