容器内存储或向容器内加装油品，不可装满，应预留5％～7％的气体空间，以备油品受热膨胀

补全对话，每空限填一个单词

A: Hey, Mary.  What's wrong?

B: I had an   1   with my best friend. What should I do?

A: Well,you could   2   him a letter.

B: I don't think    3    .I don't like writing letters.

A: Maybe you should    4   him up.

B: No.I don't want to talk about it    5   the phone.

A: Well,you should say you're sorry.

B: Yes,I know I should,but it's not easy.

A: Maybe you could go to his house.

B: I guess I could,but I don't want to surprise him.

A: Hey,I know. You could give him a ticket     6   a ball game.

B: Well,that is a good idea,but I don't have enough money.

Both bus and tree topologies are characterized by the use of multipoint （） . For the bus, all stations attach, through appropriate hardware （） known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received fromthe （） . A transmission from any station propagates the length of the medium in both directions and can be received by all other （） . At each end of the bus is a （） , which absorbs any signal, removing it from the bus.

Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received fromthe（）.

A．tree

B．bus

C．star

D．ring

帕金森病的发病机制与黑质和纹状体内哪种神经递质明显减少有关（）

A.多巴胺

B.乙酰胆碱

C.5-羟色胺

D.肾上腺素

E.γ-氨基丁酸

传统经济发展模式存在的问题是（）

①不注重生态环境的保护

②没有考虑生态成本

③往往造成生态环境的破坏

④注意了物质的分层多级利用

A．①②

B．②③

C．②③④

D．①②③

在构成CRH1整节编组的3个动力单元TBU中（）。

A、TBU1和TBU2完全对称

B、TBU1，TBU2，TBU3均不对称

C、TBU1和TBU3完全对称

D、TBU2和TBU3完全对称