焊接0Cr18Ni9的焊条应选用______。
A．A002
B．A102
C．A132
D．A407
参考答案：B
肾结核最早出现的症状是
A．尿频
B．尿急
C．腰痛
D．血尿
E．脓尿
Closely related to the Communicative Approach is ______, the study of how language is used in communication.
