The trap is commonly used for floats, thermal power, free - float, double - metal - style , pulse, and so on - bell - shaped float.常用的疏水阀有浮桶式 、 热动力式 、 自由浮球 式 、 双金属片式、脉冲式 、 钟形浮子式等....
The pain racked him.痛苦折磨着他.The country is now racked by three violent separatist movements.这个国家目前正被3场激烈的分离主义运动所困扰。He racked no rents to maintain the expenses of his establishment.他不向租户索取过高的租金来维持公司的开支。A toothache racked m...