管道过滤器的局部水头损失,宜取( )MPa。
A.0.001~0.04
B.0.002~0.03
C.0.004~0.05
D.0.025~0.04
参考答案:D
The old man has________ useful horse and horse can do a lot of things for him.
A.an; a
B.the; a
C.an; the
D.a; the
亚硝酸盐中毒,解毒剂选用
A.二基丙醇药B.贝美格C.亚甲蓝D.硫代硫酸钠E.阿托品、解磷定