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