重复性实验是考查候选方法的（）A．操作误差 B．方法误差 C．随机误差 D．比例系统

在横线里填上“＞”，“＜”或“=”．

150×50______15×500180×30______210×30

23×40______32×3027×200______20×270．

下列选煤方法中，不属于重力选煤的有（）。

A、干法选煤

B、跳汰选煤

C、重介质选煤

D、浮选

下列关于农作物与温度带及省区搭配正确的是（　　）

A．花生-暖温带-山东

B．大豆-暖温带-黑龙江

C．甜菜-亚热带-江西

D．油菜-暖温带-湖南

阅读理解。

    Pocket Tape-Recorders"Family and Home Magazine"test what's on the market now.

1)Pearlcorder S702 $64

  This simple model at the bottom of the Olympus range scored the most points for its excellent quality of recording. Background noise hardly affects the sound and recording from a pocket is perfectly possible, but it doesn't turn off automatically.

Tape length: 30 minutes per side. Weight:240g.

2)Sony M9 $49.95

    Small and very good looking, sony's latest offering scored most for appearance. Sounds clear, but there is slight machine noise. The big control buttons are a great improvement on some of the complicated little controls on other tape-recorders. Doesn't switch off automatically but a red light shows if the machine is still running.

   Tape length: 60 minutes per side. Weight: 195g.

3)Sony M400 $115

    Lots of little control buttons that make a noise and are difficult to use . Recording was good but machine noise lost points. Tape counter and automatic switch-off when tape has finished recording or rewinding are useful Tape length: 60 minutes per side. Weight: 230g.

4)Imperial OEM. MC $29.95

    Cheap and simple compared with the rest, but recording was good as long as there was no background noise. Use only its own make of cassette. No light to show it is on; no fast forward button and the record button makes a loud noise.

    Tape length: 30 minutes per side. Weight: 285g.

5)Philips 585 $80

   Handsome and simple to use, but recording is very poor at more than the recommended distance of 5 cm-designed for dictation. No recording light. Tape length: 15 minutes per side. Weight: 220g.

1．The machine that produces the best recording with the least unwanted noise is the           .

A．Pearlcorder S702  

B．Sony M9    

C．Sony M400

D．Imperial OEM MC7

2．It you want a machine which turns off automatically and weighs very little you should choose the          .

A．Pearlcorder S702    

B．Sony M9    

C．Sony M400

D．Philips 585

3．Which machine is unsuitable for general use?

A．Pearlcorder S702

B．Imperial OEM MC7

C．Sony M400

D．Philips 585

4．What disadvantage does only the Imperial OEM MC7 have?

A．No light shows when it is on

B．It requires a special cassette.

C．It picks up background noise.

D．The record button makes a noise.

我国的《公路沥青路面再生技术规范》建议水泥等活性填料一般不超过（）

A.1%

B.1.5%

C.2%

D.2.5%