管路系统的特性曲线是随着()的增加而上升。
A、流量
B、扬程
C、轴功率
D、效率
参考答案:A
Believe it or not, the matter, ________ we argued for a long time, was in fact related to our study.
A.over it
B.with them
C.about which
D.for which
DCS操作中LL表示()。
A、超高报
B、超低报
C、高报
D、低报