【简答题】下图是机床工作台自动往复运动主电路和控制电路,说明其工作过程和各电器元件的作用。 。
【单选题】A proton is placed in an electric field of intensity 700 N/C. What is the magnitude and direction of the acceleration of this proton due to this field?
A.
6.71 × opposite to the electric field
B.
6.71 × in the direction of the electric field
C.
67.1 × opposite to the electric field
D.
67.1 × in the direction of the electric field
【简答题】What is the field of discourse? 什么是话语范围?
【单选题】What are the students mainly discussing?
A.
What they learned on a field trip.
B.
Strategies for test preparation.
C.
The impact of their studies on their daily lives.
D.
Planning for possible financial emergency.
【多选题】根据税收征收法律制度的规定,下列各项税款中.税务机关可以无限期追征的有( )。
D.
因纳税人计算错误未缴或者少缴的税款在10万元以上的
【简答题】We are quite ignorant of what has been achieved in this field.(nothing) ____________.
【单选题】在汽车上,发动机和手动变速箱之前安装有( )。
【简答题】若分拣单元工作任务中规定电动机的运行频率固定为30Hz,可以只连接一个变频器的速度控制端子,例如“RH”端,设定参数Pr.79 =( ),同时须设定( )=30Hz。这样,当FR-E740的端子“STF”和“RH” ON时,电机启动并以固定频率为30Hz的速度正向运转。