在煤气厂内,在尚未脱硫净化的煤气管道上,不能采用()密封面的阀门。
A.铜合金
B.不锈钢
C.巴氏合金
参考答案:A
I’m blessed______ a happy childhood, ______ most people would like to have.
A.to; that
B.with; as
C.to; which
D.with; one that
悬浮物SS指()
A、总残渣
B、总可滤残渣
C、总不可滤残渣