如图所示表示两列相干水波的叠加情况,图中的实线表示波峰,虚线表示波谷.设两列波的

题型:选择题

问题:

如图所示表示两列相干水波的叠加情况,图中的实线表示波峰,虚线表示波谷.设两列波的振幅均为5cm,且图示的范围内振幅不变,波速和波长分别为1m/s和0.5m.C点是BE连线的中点,下列说法中正确的是(  )

A.图示时刻C点正处于平衡位置且向水面下运动

B.从图示的时刻起经0.25s,B点通过的路程为20cm

C.C、E两点都保持静止不动

D.图示时刻A、B两点的竖直高度差为10cm

考点:波的叠加
题型:选择题

第三部分:阅读理解(共12小题;每小题2分,满分24分)

阅读下列短文,从每题所给的A、B、C、D四个选项中,选出最佳选项,并在答题卡上将该项涂黑。

GARDEN RESTAURANT

Telephone :2706030

Address :920 Bridgeport Road

Open :Mon. to Fri. 7:00a.m.-2:30p.m. and 5:00p.m.-9:00p.m.

Sat. 7:00 a.m.-11:00a.m. and 5:00p.m.-9:30p.m.

Sun. 11:00 a.m.-2:00 p.m. and 5:00 p.m. -9:30 p.m.

NEW YORK MUSEUM

Telephone :7364431

Address :Vanier Park,1100 Chestnut St. New York America’s largest museum specializing in American history and art of our active people .

Open:Mon. to Fri. 9:00a.m. -5:00p.m. (Monday free) Sat. 9:00a.m.-1:00p.m.

LANSDOWNE PARK SHOPPING CENTER

Telephone :3562367

Address :5300  No. 3 Road

Open :Mon.,Tues.,and Sat.:9:30a.m.-5:30p.m.

Wed.,Thurs.,and Fri.:9:30a.m.-9:30p.m.

Sun : 11:00a.m.-5:00p.m.

SKYLINE HOTEL

Telephone :2785161

Address :3031 No. 3 Road(at Sat Island Way)

The Hangar Den :Wed. to Sun. lunch from 10:30a.m.

Coffee Shop :Mon. –Fri.6:30a.m. Sat.6:30a.m. and Sun. 7;00a.m.

Mon. –Wed. to 10:00p.m. Thurs. –Sun. to 11:00p.m.

46.  If  you want to go out for lunch on Sunday you can call up the number        .

A. 2785161 or 1706030              B. 2706030 or 3562367

C. 7364431 or 2785161              D. 3562367 or 2785161

47.  You do not have to pay on Mondays if you go to        .

A. Skyline Hotel                    B. Lansdowne Park Shopping Center.

C. New York Museum.               D.Garden Restaurant

48.  If  you want to enjoy yourself on Sunday mornings ,you can go to        .

A. 5300 No. 3 Road                 B. Vanier Park , 1100 Chestnut St.

C. 9020 Bridgeport Road             D. 3031 No. 3 Road

49.  What can you do after 2 o’clock on Saturday afternoon?

A. Visit New York Museum.

B. Do some shopping in Lansdowne Park Shopping Center.

C. Have coffee in Skyline Hotel.

D. B or C.

题型:选择题

关于模锻生产以下说法错误的是()。

A.设备投资低

B.生产周期较长

C.模锻成本较高

D.使用寿命低

题型:选择题

碎矿和筛分是选前的准备阶段,它的目的是使原矿中的有用矿物达到单体分离,为选别创造条件。

题型:选择题

运动员训练水平包括哪些方面?

题型:选择题

()饱和蒸汽压大的物质称为物质。

A、对挥发性

B、不挥发性

C、易挥发性

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