水罐及泡沫液罐需用耐腐蚀的材料制成，不须经过防腐蚀处理。
查看答案
在阀门型号中“Q”代表球阀。
A. 正确
B. 错误
根据自然条件和耕作制度特点，我国小麦栽培大致划分为哪三类地区？
Each drilling unit equipped with helicopter fuel storage tanks must have the tanks installed as far as practicable from the（）.
A. landing area and sources of vapor ignition
B. main deck
C. engine room
D. drill floor
微信支付 
支付宝支付