第一硬腭由胚胎的哪一部分生长发育而形成() A.中鼻突 B.侧鼻突 C.上颌突 D.

题型:单项选择题 B型题

问题:

第一硬腭由胚胎的哪一部分生长发育而形成()

A.中鼻突

B.侧鼻突

C.上颌突

D.下颌突

E.额鼻突

考点:口腔五官科主治医师口腔颌面相关专业知识口腔颌面外科学相关专业知识考前冲刺一
题型:单项选择题 B型题

If you are lost in the mountains, stay calm in the face of darkness, loneliness, and the unknown. It will greatly increase your chances of survival (生存). Many people think that preparing necessary equipment and knowing how to use it are very important, but actually eighty percent of mountain survival is your reaction to fear.

Find a hiding place.

Unnecessary labor will make you sweat and make you cold. Find a hiding place around you before trying to start your own construction. If you are in a snow-covered area, you may be able to dig a cave in deep snow for protection from the wind. You should try to hide yourself in the middle of the mountain if possible. Stay out of the valleys — cold air falls, and the valley floor can be the coldest area on the mountain.

Signal rescuers for help.

The best time to signal rescuers is during the day. Signal for help from the highest point possible — it will be easier for rescuers to see you, and any sound you make will travel farther. If you take a box of matches and a space blanket (a special blanket for traveling), build three smoky fires and put your blanket — gold side facing out — on the ground.

Do not walk away.

It will make finding you more difficult, as search teams will be trying to follow your path and may miss you if you have gone off in a different direction. Searchers often end up finding a car with no one in it.

If you get frostbite (冻伤), do not rewarm the affected area until you’re out of danger.

You can walk on frostbitten feet, but once you warm the area and can feel the pain, you will not want to walk anywhere. Try to protect the frostbitten area and keep it dry until you are rescued.

36. When lost in the mountains, you can increase your chances of survival if you      .

A. take a space blanket with you            B. do more physical labor

C. try to find a car immediately                    D. walk as far as possible to find help

37. According to the passage, people most probably fail to survive if they      .

A. do not take enough equipment           B. stay in the middle of the mountain

C. do not keep themselves warm            D. stay in a snow-covered area

38. What can we infer from the passage?

A. Don’t travel by yourself.                   B. Mountain traveling is dangerous.

C. Don’t get frightened in danger.          D. Avoid going to unfamiliar places.

题型:单项选择题 B型题

为了保证车辆正常行驶和运送货物安全,驱动桥应()。

A、转动灵活

B、不弯曲,变形和漏油

C、坚周,耐用

D、无阻滞

题型:单项选择题 B型题

现有60℃时硝酸钾的饱和溶液,若将其温度降到20℃,此时有关该溶液的说法不正确的是  [ ]

A.仍为饱和溶液

B.硝酸钾的溶解度发生了变化

C.降温前后溶液的质量不变

D.降温前后溶剂的质量不变

题型:单项选择题 B型题

班主任的主要任务是()。

A.组建良好的班集体

B.抓好课堂纪律

C.开好主题班会

D.评定学生操行

题型:单项选择题 B型题

纺织业的资本一产出比率大于饮食服务业。()

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