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如何应用矮化技术？

答案

参考答案：

在砧木为乔砧，接穗也是乔化品种时，通过人工致矮技术，也可以实现矮化密植。人工致矮技术的机制，总是以直接或间接削弱根系活动为前提的，通过破坏地上和地下部的物质供应的相互关系来限制树体的生长。

（一）控制树冠

（二）控制根系

单项选择题

During our two months on the road, Bennett and I had a really (1) experience with a good, honest (2) and some helpful mechanics.

We were driving east on Highway 10 when our "chick engine" light came on. We limped of a(n) (3) into Las Cruces. We had a real car (4) Bennett nursed the ear into a local garage. By this time the car was missing so (5) it was shaking all over. This was the (6) time to arrive at a garage—late Friday afternoon. Service adviser Scott was busy (7) paper work and customers as we (8) our problems. (9) he was already "ten cars behind", he told us to pull the car into the garage.

Lincoln, who we later (10) was one of the two motor technicians, took (11) of our car repairing. He and Scott and some other mechanics stayed several hours after closing, (12) the car.

Early the next morning (the shop was officially closed on Saturdays), Lincoln finally located the (13) and fixed it easily within only (14)

Later Scott (15) out to us that it was our attitude that helped. "You didn’t come into the place demanding this or that. You showed an (16) of our problems on a busy Friday afternoon. Customer’s attitude means a lot. " He was right in some way, customers should show (17) and understanding to people who (18) them. (19) people were extremely busy, they found way to at least try and help when they are met with politeness.

The pleasant experience I had shows that (20) for other people can always help.

2（）

A.station 

B.studio 

C.factory 

D.garage
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问答题

实验室用固体烧碱配制500mL 0.10mol•L-1的NaOH溶液．

（1）需称量______g烧碱，由于烧碱具有腐蚀性，同时易潮解，应放于______（填仪器名称）中在托盘天平上称量．

（2）整个实验过程中，不需要的仪器（填写字母）______

A．药匙   B．胶头滴管   C．玻璃棒    D．漏斗    E．烧杯    F．托盘天平

（3）根据实验需要和（1）（2）所列仪器判断，完成实验还缺少的仪器是______

（4）配制时，该实验两次用到玻璃棒，其作用分别是______、______．

（5）配制NaOH溶液时，下列操作情况会使结果偏高的是______（填写字母）

A．转移溶液前，容量瓶中有少量蒸馏水未倒出

B．定容时，俯视容量瓶刻度线观察液面

C．定容后，倒置容量瓶摇匀后平放静置，液面低于刻度线，再加水定容

（6）配制过程有以下操作：

A．转移    B．称量    C．洗涤    D．定容    E．溶解    F．摇匀

其正确的操作顺序应是______（填写字母）
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