通过哪些现象可以判断出氢氮比失调?
参考答案:
①合成塔压力升高;
②床层温度下降;
③循环气量增加;
④出口氨浓度降低;
⑤压缩机打气量出现波动;
⑥压缩机耗汽量上升。
( )是一个能够全面反映基金在一定时期内经营成果的指标。
A.期末可供分配利润 B.本期公允价值变动损益C.本期利润 D.未分配利润
— It seems that Mr. Wu is standing there.
— It ______ be him because he called me from Canada just now.
A.mustn’t
B.can’t
C.needn’t
D.shouldn’t