logo - 刷刷题
下载APP
【单选题】

蒸汽加热器的蒸汽从管架引到其主阀前时,其蒸汽主阀及主阀旁路的状态分别是()。

A.
(A)全部关闭
B.
(B)蒸汽主阀、旁路均打开
C.
(C)蒸汽主阀关闭、旁路阀全开
D.
(D)没有具体要求
举报
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】Most shoppers know the feeling. You stand in front of piles of organic produce and wonder what those premium prices are buying you over and above what you get from standard foods. Not a lot nutrition-...

A.
do not use naturally produced fertilisers
B.
produce carbon dioxide when removing weeds
C.
use high doses of weed-killer
D.
use too many resources to qualify for organic status

【多选题】⾼压加热器分为()

A.
混合式
B.
表⾯式
C.
对流式
D.
逆流式