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【单选题】
在实验中或工业生产中,常把零压差下的流量(即负载为零时泵的流量)视为理论流量 ;有些液压泵在工作时,每一瞬间的流量各不相同,但在每转中按同一规律重复变化,这就是泵的流量脉动。瞬时流量一般指的是瞬时( )。A.
实际流量
B.
理论流量
C.
额定流量
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举一反三
【单选题】When she was thirty years old, she really wanted to get __________. [ ]
A.
married
B.
marrying
C.
to marry
D.
marry
【单选题】Which is the duty of a concierge?
A.
Handling baggage for hotel guests
B.
Updating the periodical report of guest resources.
C.
Keeping in contact with guest resources.
D.
Maintaining accurate files on all reservations.
【简答题】Why is the concierge very important for a hotel?
【单选题】Why is the concierge very important for a hotel?
A.
Because they have a "can-do" attitude.
B.
Because they are problem-solving experts.
C.
Because they have a network of acquaintances.
D.
Because they can provide the guest with some help that the hotel maybe couldn't offer.
【简答题】I'll keep at it—whatever the challenges might be—and never give up until I achieve Success.
【单选题】She said ______ of her parents wanted her to marry him.
A.
none
B.
no
C.
neither
D.
every
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