【单选题】It was on October 1st _____ new China was founded.
【简答题】Rotary pumps come in four main types: (single and multiple), (internal and external), (sliding and flexible), and .
【判断题】计算机数字量控制系统,属于连续控制系统。
【单选题】普惠制产地证第12栏“出口商声明”(Declaration by the exporter)一栏应填写的内容有( )。
【单选题】October 1st is the day_________our country was born. A.which B.that C.when D.where
【单选题】设备工况监测是通过测定机器______,来探明机器的工作状态。