【单选题】5 Mark suggests that they _____.
A.
eat their picnic while travelling along the river
B.
move over to the bank and stop for a while
C.
eat their picnic in about ten minutes
D.
move over to the bank and eat their picnic
【判断题】公园人行步道设计 宜 “ 曲 ” 不宜 “ 直 ”。
【单选题】Mark suggests that he punt for _____.
【单选题】线路速度160km/h<VMAX≤200KM/h时,作业人员下道避车时,距钢轨头部外侧一般应不小于()
【单选题】线路速度160km/h<VMAX≤200KMph时,作业人员下道避车时,本线来车距离不小于()m时,下道完毕
【简答题】51系列单片机具有几个中断源?其中哪些中断源可以被定义为高优先级中断,如何定义?
【简答题】51系列单片机具有几个中断源,分别哪几个?其中哪些中断源可以被定义为高优先级中断,如何定义?