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