台年进尺
参考答案：
全年完成的钻孔进尺与平均开动钻机数之商。
----we’ve spent too much money recently.
----well, it isn’t surprising. Our friends and relatives______around all the time
A．are coming
B．had come
C．were coming
D．have been coming
销售包装又称内包装和小包装，主要考虑商品的物理、化学性质，保护商品在销售、运输过程中不被损坏。( )
