什么是植物抗性?

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问题:

什么是植物抗性?

考点:绿化工考试园林绿化工考试园林绿化工考试题库
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Last year I travelled to Paris by plane. I was very excited because I knew I would meet a lot of interesting people and see some amazing things there. On the night before I left, I was so excited that I couldn’t sleep at all. When I sat on the plane the next day, I felt very tired. I wanted to have a good sleep during the 9-hour flight. Unluckily, there was a baby sitting next to me. It cried and screamed during the whole trip. How could I fall asleep with all of that noise?

When I arrived in Paris at last, it was already 8 o’clock in the evening. I felt even more tired. After getting off the plane, I went to my hotel at once. I paid no attention to the beautiful evening scenery of Paris. I just wanted to have a good rest in my room. When I lay down on the comfortable bed, I fell asleep very quickly.

A sudden noise woke me up at midnight. I didn’t know what happened, so I turned on the light. What did I see? You wouldn’t believe it! I saw two mice playing on the floor!

What a terrible trip!

小题1:How did the writer travel to Paris?

A.By train.

B.By plane.

C.By boat.

D.By car.小题2:When did the writer probably start his trip?

A.At about 9 a.m.

B.At about 10 a.m.

C.At about 11 a.m.

D.At about 12 a.m.小题3:Why did the writer feel even more tired when he arrived in Paris?

A.Because he didn’t sleep well the night before.

B.Because he didn’t want to go to Paris.

C.Because a baby sang songs all the way during the whole trip.

D.Because the flight was too long and a baby cried and screamed during the whole trip.小题4:What did the writer see in the hotel room at midnight?

A.A mouse.

B.A cat.

C.Two cats.

D.Two mice.小题5:What can we learn from the passage?

A.The writer had a good rest in the hotel room.

B.The writer couldn’t sleep well in the hotel room, either.

C.The writer enjoyed the first night in Paris a lot.

D.The writer would never travel by plane again

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用熔断器保护电容器,熔丝的额定电流应为电容器额定电流的()倍为宜。

A.1.2~1.3

B.1.3~1.4

C.1.43~1.55

D.1.58~1.8

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时极值与正点值矛盾时,正确的处理方法为().

A.若极值出现时间出现在上一时次00分,则将极值出现时间改为上1次时01分。例如:3时极大风速的出现时间为0200,则将0200改为0201

B.若极值出现时间不在上一时次00分至该时次时间内时,如果该时极值正常,则该时出现时间改为上一时次00分,如果分析该时极值有明显偏差,则该时极值和出现时间均按缺测处理

C.若极值时间在正点,但极值与该时次相应值不一致,若极大(小)值高(低)正点的相应值,则用该时极值代替该时正点值,若极大(小)值低(高)正点的相应值,则用该时正点值代替该时极值

D.若极值出现时间不在上一时次00分至该时次时间内时,如果该时极值正常,则该时出现时间按缺测处理,如果分析该时极值有明显偏差,则该时极值和出现时间均按缺测处理

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流行病学研究主要用于

A.研究疾病的病因

B.评价人群的健康状况

C.研究疾病预防和控制

D.考核疾病的防制效果

E.以上均是

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计算题:某棒料布氏硬度值为280HBS10/3000/10,试求压痕深度是多少?试样最小厚度是多少?

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