前纵隔不常见的肿瘤是（）-我要搜题网

[单选题]机场障碍物A型图提供的资料主要用于计划各型飞机在该机场运行时,确定符合该机型最低性能的最大允许起飞重量,这些资料包括:机场标高,跑道的(),净空道和停止道的长度,以及起飞航径区的障碍物()。
A. 宽度及纵向坡度的位置,方位
B. 宽度及纵向坡度的位置,高度
C. 长度及纵向坡度的位置,高度
D. 长度及纵向坡度的位置,方位

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[单项选择]以下关于直流电动机恒转矩调速的描述错误的是( )。
A. 在调速过程中不同的稳定速度下，电动机的转矩为常数
B. 如果选择的调速方法能使t∞I=常数，则在恒转矩负载下，电动机不论在高速和低速下运行，其发热情况是一样的
C. 当磁通一定时调节电枢电压或电枢回路电阻的方法，就属于恒转矩调速方法
D. 对恒功率负载，应尽量采用恒转矩调速方法，电动机容量才会得到充分利用

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[单项选择]机床的主轴是机器的（）。
A. 原动部分
B. 工作部分
C. 传动部分
D. 自动控制部分

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[填空题]为了加强接头，如果是利用再用品时，事先要选择两块高度（）的鱼尾板。

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[不定项选择题]根据下列内容，回答206-210题。 When my family moved to America in 2010 from a small village in Guangdong, China, webrought not only our luggage, but also our village rules, customs and culture. One of the rules isthat young people should always respect eiders. Unluckily, this rule led to my very first embarrass-ment in the United States. I had a part-time job as a waiter in a Chinese restaurant. One time, when I was serving foodto a middle-aged couple, the wife asked me how the food could be served so quickly. I told herthat I had made sure they got their food quickly because ! always respect the elderly. As soon as Isaid that, her face showed great displeasure. My manager, who happened to hear what I said, tookme aside and gave me a long lecture about how sensitive Americans are and how they dislike thedescription "old". I then walked back to the table and apologized to the wife. After the couple heardmy reason, they understood that the problem was caused by cultural differences, so they laughed and were no longer angry. In my village in China, people are proud of being old. Not so many people live to be seventyor eighty, and people who reach such an age have the most knowledge and experience. Youngpeople always respect older people because they know they can learn from their rich experience. However, in the United States, people think "growing old" is a problem since "old" shows thata person is going to retire or that the body is not working well. Here many people try to keep them-selves away from growing old by doing exercises or jogging, and women put on makeup, hoping tolook young. When I told the couple in the restaurant that I respect the elderly, they got angry be-cause this caused them to feel they had failed to stay young. I had told them something they didn'twant to hear. After that, I changed the way I had been with older people. It is not that I don't respect themany more; I still respect them, but now I don't show my feelings through words. By Jack Jack brought the couple their food very fast because___________.
A.the manager asked him to do so
B.he respected the elderly
C.the couple wanted him to do so
D.he wanted more pay

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[单选题]LKJ-2000型监控记录装置施行紧急制动时,不允许司机( )。《LKJ2000乘务员手册》
A.解锁
B.缓解
C.移动手柄

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[单选题] 关于走向的描述,以下说法正确的是( )。
A.和等高线的方向相同
B.与等高线垂直,指向标高低的方向
C.与等高线垂直,指向标高高的方向

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[单选题]煤料结焦过程中在炭化室内停留的时间称为( )。
A.结焦时间
B.周转时间
C.操作时间

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[单项选择]老年痴呆症诊断中最早最突出的症状是（）
A. 外貌衰老
B. 情绪激惹
C. 步态蹒跚
D. 记忆障碍
E. 言语障碍

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[单选题]班主任工作计划中比较完整的计划是（　　）。
A.月计划
B.学期计划
C.具体的活动计划
D.周计划

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[判断题]普通单开道岔由转辙器、辙又及护轨组成。
A.正确
B.错误