等速送丝埋弧自动焊送丝速度减小，则焊接电流（）。
A、增大
B、减小
C、不变
D、略增
参考答案：B
. --- The company spent thousands of dollars to promote its new product.
--- They _____: the world itself was more than ready to buy.
A．shouldn’t have bothered
B．needn't have bothered
C．couldn’t have bothered
D．mustn’t have bothered
Rathke囊肿，常位于（）
A.鞍内
B.鞍上
C.鞍旁
D.鞍下
E.四叠体池
