【单选题】Which expression has the different meaning from entry into force ? “entry into force” means is().
【判断题】(............)当其他电器的触头数或触点容量不够时,可借助中间继电器作中间转换用。
【单选题】Just as a force is required to change the speed of an object, __________ a force must act to cause a change in the direction of the motion.
【简答题】What is force majeure?
【多选题】“时势造英雄”与“英雄造时势”两者表现的是:( )