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问题 单项选择题

离心式制冷压缩机操作和维修时，应注意必须在透平机排气口法兰和第一级截流阀之间安装（），以免损坏透平机。

A.闷头法兰

B.缷荷阀

C.堵塞盖板

D.速度截断装置

答案

参考答案：B

单项选择题 A1型题

液体在固体表面的润湿程度，常以接触角θ大小来表示。当0°<θ<90°时表示（）

A.固体表面被液体完全润湿

B.固体表面能被液体润湿

C.固体表面难以被液体润湿

D.固体表面完全不被液体润湿

E.液体内部的化学键力产生表面张力
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填空题

Column A


①language acquisition device (LAD)
②stimulus and response
③the discourse theory
④acquisition and learning
⑤the input hypothesis

Column B


a. The former refers to the subconscious process leading to the development of "competence"; the latter refers to conscious study and knowledge of grammatical rules.
b. A sort of mechanism or device which contains the capacity to acquire one’s first language.
c. It assumes that humans acquire language in only one way—by understanding messages, or by receiving "comprehensible input".
d. It believes there is little difference between the first language acquisition process and the process of second language acquisition—only through communication discourses.
e. The former serves to elicit behaviour; the latter is triggered by the former.
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