F-7型分配阀设有四个风缸,这四个风缸和管号对应正确的是()。
A.工作风缸管22
B.降压风缸管26
C.紧急风缸管21
D.作用风缸管11
参考答案:B, C
Some fruits are so easily harvested in this area that they are never of great _____
A.fare
B.benefit
C.help
D.worth
水轮机转轮补焊修复后的质量要求是什么?