凝气式汽轮机停机1小时以后，润滑油系统可以停。
参考答案：错
解析：凝气式汽轮机停机后，润滑油系统至少继续供油2～12小时。
Only after a baby seal is pushed into the sea by its mother _______to swim.
A． how will it learn
B．will it learn how
C． it will learn how
D．and it learns how
冰铜吹炼目的是什么？
