简述产业资本连续循环的两个基本条件。

小麦收获适期为蜡熟期。

阅读理解。

                                                                        Events

     Long March exhibit

     The Shanghai History Museum is putting on exhibition to remember the Long March (长征) which took

place 75 years ago. More than 220 photos and 40 other things are on show. All the exhibition is explained in

Chinese. The show will end on November 20.

     Time: 10:00 a. m.-4:00 p.m.

     Address: 1286 Hongqiao Road

     Ticket: 8 yuan for Chinese / 15 yuan for foreigners

     Thai elephants

     Eight elephants from Thailand ate an attraction for visitors at Changfeng Park by riding bikes, playing

basketball, dancing and blowing a musical instrument. The elephants give three shows a day at 9:30 a.m.,

3:30 p.m. and 8:00 p.m, and there is an extra show at 1:30 p.m. at weekends. The show will end on November

15.

     Address: 189 Daduhe Road

     Ticket: 30-40 yuan

     Dancing dolphins

     Dolphins jumping from the water to touch a ball, dancing to music, kissing people and doing easy math

problems, and seals and sea lions, also parroting, hove rode a large part of the aquarium in Peace Park, which

interests children greatly.

     Hours: 10:30 a.m., 4:00 p.m., and 7:30 p.m.

     Ticket: 20 yuan for adults and 10 yuan for children

1. Where can one see the Long March exhibition?

A. In Shanghai History Muse.

B. In Changfeng Park.

C. In Peace Park.

D. On 189 Dahude Road.

2. How many shows do Thailand elephants give at weekends?

A. One.

B. Two.

C. Three

D. Four.

3. What may interest children very much in Peace Park?

A. Elephants playing basketball.

B. Dolphins dancing to the music.

C. Seals riding bikes.

D. Sea lions blowing instruments.

4. How much should a child pay to go into Peace Park?

A. Five yuan.

B. Fifteen yuan.

C. Ten yuan.

D. Twenty yuan.

5. Which of the following is true?

A. The Long March exhibition is explained in English.

B. The sea animals can work out difficult math problems.

C. Thai elephants' shows can only be seen in the day.

D. The sea animals perform three times a day.

用酸性氢氧燃料电池为电源进行电解的实验装置示意图如下图所示。下列说法中，正确的是

A．燃料电池工作时，正极反应为：O₂ + 2H₂O + 4e^-＝ 4OH^-

B．a极是铁，b极是铜时，b极逐渐溶解，a极上有铜析出

C．a极是粗铜，b极是纯铜时，a极逐渐溶解，b极上有铜析出

D．a、b两极均是石墨时，在相同条件下a极产生的气体与电池中消耗的H₂体积相等

如图所示的量筒是以 _________ 为单位标度的，最小分度值是 _________ ；测量时如果如图那样读数，则读出的液体体积与真实值相比 _________ （填“偏大”、“偏小”或“相等”）．

木工用锯按其构造不同可分为（）等。

A、刀锯

B、侧锯

C、板锯

D、框锯