粉末火焰喷涂不适用于修复承受（）载荷和（）载荷的零件。
A.静/冲击
B.动/冲击
C.低应力交变/冲击
D.高应力交变/冲击
参考答案：D
His efforts to raise money for his program were ________ because no one showed any intention to take
a cent out of their pockets. [ ]
A. in place
B. in sight
C. in effect
D. in vain
斜纹路
