Liping has never gone to Japan, but he speaks Japanese____ he were Japanese.

A．even if

B．as though

C．even so

D．as long as

焊料焊接中，焊料流布的特点是

A．向温度高处流

B．向温度低处流

C．向位置高处流

D．向位置低处流

E．向温度高、位置低处流