问题 问答题 简答题

泵站中决定离心泵装置工况点的因素有哪些?

答案

参考答案:决定离心泵装置工况点的因素有:泵型、实际n值、输配水管路布置及水池和水塔(高地水库)之水位值和变动等边界条件。

选择题
阅读理解

Ellis Island is located in New York. Harbor Ellis Isl and is open daily year-round from 9:30 a.m. to 5 p. m. , with extended hours during summer. It is closed December 25. There is no admission charge to Ellis Island; donations(捐款)are gratefully accepted.

At Your Fingertips

Park information      (212)363-7620

Emergencies         (212)363-3260

Ferry boat information  (212)269-5755

Lost and found          (212)363-7620

Dining, gifts, & audio tour (212)344-0996

Transportation

Statue of Liberty a nd Ellis Island Ferry: Boats leave from Battery Park, Manhattan, and from Liberty State Park, New Jersey. They run about every 30 to 45 minutes beginning at 9:15 a. m. (ferry schedule subject to change)

Hours: May vary; call the number below

Closed: December 25

Ferry fees: (Includes Liberty and Ellis Islands) adults, $7; senior citizens, $6; children(age 3 to 17), $3. (group rates are available for 25 or more adults)

Ticket & schedule information:    (212)269-5755

小题1:Which number would you call if your friend were suddenly ill?

A.(212)344-0996

B.(212)363-7620

C.(212)363-3260

D.(212)269-5755小题2:Which of the following is not true?

A.People can visit Ellis Island free of charge.

B.The boats departure time is at 9:15 a.m. all the year round.

C.Ferry fees for children are cheaper than for adults.

D.Ferry fees for group visitors can be reduced.小题3:We may infer from the passage that _________.

A.visitors prefer to go to Ellis Island by boat

B.there are more visitors in winter

C.Ellis Island is open every day

D.Boat is the only transportatio n to Ellis Island