PLC与强电设备最好使用不同的接地点,接地点与PLC距离应小于()m。 A.50 B

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问题:

PLC与强电设备最好使用不同的接地点,接地点与PLC距离应小于()m。

A.50

B.60

C.70

D.80

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题型:单项选择题
根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
How to keep healthy? It’s easy for us to catch a cold in winter and spring because the weather changes a lot in spring and it is too cold in winter. But if we take care in our life, all of us can keep healthy without any cold.
    1    . This will stop germs(细菌,病毒) passing from one person to another. When you finish your work or before you eat, you’d better wash your hands.
    2     . Use a tissue(纸巾), and then throw it into dustbins at once. When others around you are coughing, I advise you to turn your head away from the people so that their viruses won’t reach you.
Get more fresh air. Germs like staying around in dry and warm rooms.    3    . Don’t stay too long in the places with too many people.
If flu is going round house or school, you should try to stay away from those who are ill.    4   
Boil your toothbrush for about a minute. This kills germs .   5      . If you have used the toothbrush for three months or so, throw it away and buy a new one.
A. Have a shower every day
B. Wash your hands often
C. Don’t use your hands when coughing  
D. Don’t go out often when you are coughing
E. Besides, don’t use the same toothbrush too long
F. In this way, you won’t be infected by these people
G. you’d better stay in the places with more fresh air
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患者,男,22岁,建筑工人。川、时前从高处坠下,左足先着地,左膝关节过度内翻。伤后左膝关节剧烈疼痛、肿胀和皮下瘀肿。膝关节无法活动,不能行走,膝外翻畸形

对有移位骨折,应施行手法复位或持续牵引,目的是()。

A.有利于患者的早期活动,提高疗效

B.防止膝关节僵硬粘连

C.防止骨折移位

D.恢复胫骨关节面的完整和下肢正常的生理轴线

E.防止下肢肌肉萎缩

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