当焊丝直径为1.5mm-2.2mm时,自动理弧堆焊的送丝速度为()。
A.60m/h-180m/h
B.80m/h-200m/h
C.100m/h-220m/h
参考答案:A
-Why is the girl crying so sadly?
-She is forbidden_________ in __________ her sick mother. [ ]
A. dropping ; on
B. to drop ; on
C. dropping ; at
D. to drop; to
竣工图章必须(),不准(),不准()。