常开

例句与用法

She tried to forget herself, to keep cheerful, and be satisfied with doing right .
她努力忘掉自己，总是笑口常开，并且满足于多做好事。
It is easy to open a shop but hard to keep it always open
开设店铺易，维持常开难。
Heating cooling derivation time : 03600s control period : 1120 s
无源开关量常开：报警时闭合
Mechanical pressure switch , 1 nc , no
机械压力开关， 1个常闭点常开点
And it can be set to forbidden , always open or always closed by f50
设置为禁用常开或常闭。
Switching point , nc and no can be programmed individually
开关点常闭常开点都可以分别编程。
It is the tear of the earth that keep her smiles in bloom
因着大地的泪水,使她的微笑常开不谢
1 or 2 , no or nc , output p - or n - switching
1或2个，常开或常闭点，
I used to deliver pizzas in this car
我过去常开着这车去送比萨饼
Live well , love lots and laugh often
善待生活，博爱，笑口常开。