与希腊化时期的精确科学相比，罗马时期的西方注重于具体应用。
参考答案：对
This is the third book that he has written in the past five years, the first of I really enjoyed.
A．which
B．that
C．those
D．them
试验台的（）连接到油泵时用空心的进油螺栓。
A.进油管
B.回油管
C.出油管
D.高压油管
