[单选题]下列那些部件要参与刹车源的选择（ ）
A.备用刹车选择活门和刹车计量活门
B.储压器隔离活门和刹车计量活门
C.压器隔离活门和防滞活门
D.备用刹车选择活门和储压器隔离活门

[单选题]下列哪些部件要参与刹车源的选择（ ）
A.备用刹车选择活门和刹车计量活门
B.储压器隔离活门和刹车计量活门
C.压器隔离活门和防滞活门
D.备用刹车选择活门和储压器隔离活门

[单选题]刹车源灯（ ）
A.表示失去正常、备用和刹车储压器刹车源；
B.表示储压器充气失效；
C.当正常刹车系统压力低于1400PSI而且备用刹车源被自动选择时就亮；
D.表示已经失去正常和备用刹车压力源。

[单选题]刹车源灯亮（ ）
A.表示失去正常、备用和储压器刹车压力源；
B.当备用刹车被选择时，它就亮；
C.当正常和备用刹车压力太低时，它就亮；
D.表示刹车储压器充气压力低。

[单选题]绞车的零部件要（ ）。
A.齐全完整
B.主要零部件齐全完整
C.破损不影响使用
D.缺件不大于10%

[单选题]除铁道部批准外，轮轴及零部件要按（ ）组装和检修，装用的零部件须与设计规定一致。
A.A实际结构
B.B原结构
C.C特殊结构
D.D生产需要

[多选题] 设备完好标准中零部件要( )。
A.完好
B.灵敏
C.齐全
D.质量符合要求

[单选题]柴油机( )时需解体,几乎所有的零部件要进行检测,并根据零部件的磨损及损坏情况,进行修理或更换。
A.维护保养
B.小修
C.中修
D.大修

[单选题]传动部件要经常添加润滑油，并定期更换（ ）。
A.煤油
B.柴油
C.汽油
D.机油

[判断题]在机械运行时，对出现故障的部件要及时进行拆卸和修理。
A.正确
B.错误

[单项选择]( )是指那些积极参与该项目或其利益受到该项目影响的个人或组织。
A. 工程项目参与方
B. 工程项目组织者
C. 工程项目利害关系者
D. 工程项目利益相关者

[判断题]连掘机主要部件要安装起吊环，以利于安装与拆卸；第一运输机采用边双链或三链式结构。
A.正确
B.错误

[判断题]所有询价对象均可自主选择是否参与初步询价，主承销商不得拒绝询价对象参与初步询价。（）

[判断题]对容易损坏的部件要与仪表有关人员协商,采用拆卸措施如孔板、椭圆齿轮流量计,电磁流量计、调节阀、仪表用过滤器等。
A.正确
B.错误

[不定项选择题]Student participation(参与) in the classroom is not only accepted but also expected of the student in many courses．Some professors base part of the final grade on the student' s oral participation．Although there are formal lectures during which the student has a passive role (i．e．, listening and taking notes), many courses are organized around classroom discussions, student questions, and informal lectures．In graduate discussions the professor has a "manager" role and the students make presentations and lead discussions．The students do the actual teaching in these discussions． A professor' s teaching method is another factor (因素) that determines the degree and type of student participation．Some professors prefer to control discussion while others prefer to guide the class without controlling it．Many professors encourage students to question their ideas．Students who object to the professor' s point of view should be prepared to prove their positions． In the teaching of science and mathematics, the controlling mode of instruction is generally traditional ,with teachers presenting formal lectures and students taking notes．However, new educational trends have turned up in the humanities and social sciences in the past twenty years．Students in education, society, and history classes, for example, are often required to solve problems in groups, design projects, make presentations, and examine case studies．Since some college or university courses are"practical" rather than theoretical ,they pay more attention to "doing" for themselves． The reason why some professors ask students to make presentations and lead discussions is that_______．
A.these professors are often not well prepared before class
B.these professors want to stress "doing"
C.these professors want to test the students' abilities
D.these professors are not willing to teach theory