活塞销座偏置后可以在活塞越过上止点后完成由次压力面侧向主压力面侧换向。()
A. 对
B. 错
活塞销座偏置后会使得活塞裙部尖角处得磨损加剧。()
A. 对
B. 错
All types of water pollution are ____________ to the health of humans and animals.
A. harms
B. harmed
C. harming
D. harmful
Jim’s uncle is a ____________ basketball player.
A. profession
B. professions
C. profesioning
D. professional