硫铵汽提塔顶部气相严重夹带硫铵的处理错误的是()。
A、控制硫铵进料温度至合格
B、调整塔底温度至合格
C、校对液位计和出料调节阀
D、停止蒸气供给一段时间
参考答案:D
— You won't believe it. Sam. I have been chosen as an exchange student to China .
— Congratulations ! ___ [ ]
A. That's something.
B. You did a good job .
C. That's all right.
D. You got it .
母猪怀孕期间可感染细小病毒,并引起各种形式的繁殖障碍。其中,怀孕30~50d之间感染时,主要出现( )。
A.流产
B.死胎
C.木乃伊胎
D.难产
E.胎儿死亡