102 _______ is our belief that improvements in health care will lead to a stronger, more prosperous economy.

A．As

B．That

C．This

D．It

酸性焊条特点：（）。

A.对铁锈不敏感

B.焊接时放出有害气体少

C.多用直流电源

D.焊缝金属的力学性能和抗裂性好

E.仰焊困难