______ , he could not carry the rock to the other side of the river.

A．Strong while he was

B．No matter how strong he was

C．As strong he was

D．However he was strong

热水锅炉硬度应（）

A.0、03mmol/L

B.0、04mmol/L

C.0、6mmol/L

D.0、5mmol/L