在某种存货全年需求量已定的情况下，降低订购批量，必然增加订购批次。
参考答案：对
There was a strange sound outside. Mary went out and _____ around, but she _____ nothing. [ ]
A. looked; saw
B. saw; saw
C. watched; looked
D. looked; find
诊断前列腺增生首先进行的检查是
A．直肠指诊
B．超声波检查
C．膀胱造影
D．残余尿测定
E．膀胱镜检查
