【单选题】Where one of two vessels is to keep out of the way the other________.
A.
shall not keep her course but shall keep her speed
B.
shall not keep her course and speed
C.
shall keep her course but change her speed
D.
shall keep her course and speed
【简答题】HTML,中文全称为 ,它是 一种 语言。
【简答题】系统误差、随机误差、粗大误差的特点及其产生原因是什么?
【判断题】晶体二极管在反向电压小于反向击穿电压时反向电流极小;当反向电压大于反向击穿电压后,反向电流会迅速增大。
【判断题】晶体二极管在反向电压小于反向击穿电压时,反向电流极小,当反向电压大于反向击穿电压时,反向电流会迅速增大。
【多选题】以下()和()是属于通电延时型时间继电器的开关。
【单选题】In face of failure, it is important to ______ a good state of mind.
【单选题】. Marry notices are placed in the park warning people to ____ the grass.