直线度符号为（）。A.↑ B.◎ C.┴ D.─

发布时间：2019-08-27 15:23 │ 来源：www.tikuol.com

题型：单项选择题

问题：

直线度符号为（）。

A.↑

B.◎

C.┴

D.─

考点：机械工程塑料模具设计塑料模具设计题库

题型：单项选择题

阅读理解。

     Young people can have problems with their minds. Some students become worried because they have
to study very hard. Others have trouble getting on well with people like their parents and classmates.
     Liu Wei, a Junior 2 student from Hefei, could not understand his teacher and was doing badly in his
lessons. He became so worried about it that he started to cut his finger with a knife.
    Another student, 14-year-old Yan Fang from Guangzhou, was afraid of exams. She got very worried,
and when she looked at the exam paper, she couldn't think of anything to write.
     A recent report from Jiefang Daily says about 18% of Shanghai teenagers have mental (心理的, 精神的)
problems. Their troubles include (包括) being worried and very unhappy, and having problems in learning
and getting on with people. Many students who have problems won't go for advice or help. Some think
they will look stupid (愚蠢) if they go to see a doctor. Others don't want to talk about their secret.
     Liang Yuezhu, an expert on teenagers from Beijing Anding Hospital has the following advice for
teenagers:
    * Talk to your parents or teachers often
    * Take part in group activities and play sports
    * Go to see a doctor if you feel unhappy or unwell

1. The students who often become worried or have trouble getting on with others may have .

A. mental problems
B. a headache
C. knives with them
D. no parents

2. Liu Wei cut his finger with a knife because .

A. he was afraid of his teacher
B. he wanted to frighten his parents
C. he was so worried about his studies
D. his finger was badly hurt

3. Yan Fang's problems happened whenever .

A. she studied very hard
B. she had exams
C. she talked with her parents
D. she thought of something

4. Students who have problems won't ask others for help because .

A. they won't let others think they are stupid
B. they don't think doctors can help them
C.they don't want to tell their secret to others
D. both A and C

5. Liang Yuezhu's advice tell us that .

A. it's better for the students who have mental problems to join others
B. it's unnecessary for them to be with others
C. only group activities and sports can help them
D. teachers and parents can't do anything about mental problems

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题型：单项选择题

如图所示，理想变压器原线圈接u=220

sin100πt （V）的正弦交流电源，图中电流表内阻不计．副线圈接入“110V，60W”灯泡一只，且灯光正常发光．下列说法正确的是（）

A．电流表的示数为3/11 A

B．通过灯泡的电流的频率为50Hz

C．电流表的示数为3/22 A

D．理想变压器原、副线圈匝数之比为2:1

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题型：单项选择题

属于炎症性囊肿的是（）

A.舌下腺囊肿

B.颌下腺囊肿

C.角化囊肿

D.根尖囊肿

E.萌出囊肿

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题型：单项选择题

双侧副中肾管发育不全为（）

A.先天性无 * *

B. * * 闭锁

C. * * 横膈

D. * * 纵隔

E.无孔处女膜

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题型：单项选择题

在近端可以根据DTRU的ACT灯闪烁的不同方式，判断载频目前的工作状态。以下说法不正确的是（）。

A、ACT灯常灭、DTRU未配置或者DTRU与DTMU没有建链

B、ACT灯常亮、载频所有信道都为“UNLOCKED”状态

C、ACT灯闪烁（频率和RUN灯正常时一致，为0.5Hz，即一秒亮一秒灭）、载频全部信道或部分信道为非“UNLOCKED”状态

D、ACT灯快闪、载频故障

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