发动机润滑系由（）、安全和限压装置、润滑系附属装置等组成。 _爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题多项选择题

发动机润滑系由（）、安全和限压装置、润滑系附属装置等组成。

A.润滑油的储存装置

B.润滑油升压装置

C.润滑油引导输送分配装置

D.润滑油滤清器装置

答案

参考答案：A, B, C, D

完形填空

A young student was one day taking a walk with a professor, who was commonly 21 the students’ friend. As they went 22 , they saw lying in the path a pair of old 23 , which they supposed to belong to a poor man who was employed in a 24 close by. The student turned to the professor, saying, “Let’s play the man a 25 : We will hide his shoes, and 26 ourselves behind those bushes, and wait to see his 27 when he cannot find them.”
“My young friend,” answered the professor, “we should never 28 ourselves at the 29 of the poor. But you are 30 , and may give yourself a much greater 31 by means of the poor man. Put a coin into each shoe, and then we will hide ourselves and 32 how the discovery affects him.” The student did so, and they both placed themselves behind the bushes. The poor man soon finished his work, and came 33 the field to the path 34 he had left his coat and shoes. While 35 his coat he slipped his foot into one of his shoes; but feeling 36 , he stopped down to feel 37 it was, and found the coin. Astonishment and wonder were seen upon his face. He now put the money into his pocket, but his 38 was doubled on finding the other coin. He fell upon his knees, looked up to heaven and uttered aloud a fervent（热烈的）thanksgiving, in which he 39 his wife, sick and helpless, and his children without bread. The student stood there deeply 40 , and his eyes filled with tears.

C．disappointment

B．dressing up

D．embarrassment

C．recommended

单项选择题

控制菌斑的方法中不能由个人自己操作的是

A．牙线

B．牙签

C．牙间刷

D．橡胶按摩器

E．龈上洁治术