问题 问答题 简答题

沼气池投料启动为什么要投放接种物?

答案

参考答案:

新装料沼气池的发酵原料中沼气细菌含量很少,所以沼气池启动周期长,产气慢。为了加快沼气发酵启动的速度和提高沼气池气量,要向沼气池内加入含有丰富沼气细菌的物质,即在发酵原料中加入接种物。接种物数量要达到发酵原料的10%-30%。把接种物和发酵原料均匀混合,一同加入池内。

问答题 简答题
单项选择题

It was the night of the full moon, a time which always drives Java’s young people mad with excitement.

Fireworks were lit long before the moon (1) . The big noise brought people out (2) the warm night to enjoy the interesting scene. Everywhere, there were the paper remains of (3) fireworks lying on the ground. Little boys (4) more and covered their ears as they waited (5) for the explosions.

The moon appeared above the horizon: huge, (6) ball high above the city, and the (7) filled with people, as Java began to enjoy one of the year’s greatest (8) ."the Night of the Full Moon", a festival that is especially popular (9) young people.

More and more young Javanese (10) together and walked slowly through the (11) . Joking and chatting, they moved towards the mountain (12) the city. They continued to climb (13) they reached the old temple at the (14) of the mountain.

After they were (15) the temple, they drank their water and ate their mooncakes—delicious home-made ones, (16) of dried fruit and nuts. Outside, on the mountain, young people (17) cross-legged in circles, chatting and telling each other jokes. And (18) , in their hundreds, more young people continued to make their way up the mountain to (19) the brightly shining moon.By midnight, the fireworks had stopped shooting up from the (20) city in the valley below them. But during the night, the sound continued to be heard from the distance.

12()

A. on the edge of  

B. on the way to

C. in the center of    

D. in the direction of