select count(*) from student和select count(id) from student之间的区别是什么?
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网络营销部负责跟踪车辆入库信息,并核对入库车辆相应订单,由网络营销部在()内下达发车指令至物流公司。
A. S系统
B. ERP系统
C. MRP-Ⅱ
DMS
按JB4248-86标准,高压紧固件不允许存在任何()、()和大于1.5mm的()
CO2 cylinders,which protect the small space in which they are stored must().
A. NOT contain more than 200 pounds of CO2
B. be automatically operated by a heat actuator
C. have an audible alarm
D. All of the above