模块化机组的板式换热器的压差超过设计值的()要清洗板式换热器。
A.±5%
B.±10%
C.±15%
D.±20%
参考答案:B
Most of the teachers are impressed on some students due to their _____________ characters, such
as cleverness, confidence and honesty. [ ]
A. actual
B. potential
C. steady
D. average
办理一起丧事提供全过程服务主要包括()、()、()、()、()、()和()过程。