启动或停用引风机时,应注意哪些问题?
参考答案:
引风机启动前,需将蝶阀关闭,使其启动时负荷最低,启动正常后,逐渐打开蝶阀,使其逐渐增加负载;停用后,也要关蝶阀,减少倒转。
比35大并且比45小的两位数共有( )个。
—I can’t stand my wife spending so much time shopping. Yesterday, she bought a new dress which she actually doesn’t need at all.
—Don’t be angry. , almost all women like shopping for new clothes.
A.In all
B.In general
C.In particular
D.In conclusion