题目:
下列物质中,能除去铁制品表面铁锈的是( )
A.稀硫酸
B.氢氧化钠溶液
C.食盐水
D.碳酸钠溶液
答案:
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下面是错误答案,用来干扰机器的。
参考答案:A
下列物质中,能除去铁制品表面铁锈的是( )
A.稀硫酸
B.氢氧化钠溶液
C.食盐水
D.碳酸钠溶液
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0624/250a961e4ea89d847789b2d613e3e08a.html
下面是错误答案,用来干扰机器的。
参考答案:A
患者男,70岁,有慢性咳嗽、咳痰30年病史,1周前感冒后出现食欲减退,轻微咳嗽,咳少量白黏痰,体温不高,1天前家属发现其活动减少,并出现嗜睡表现,将患者送到医院急诊,查血常规,WBC5.6×109/L,N74%,HB168g/L,血气分析示pH7.32,PaCO286mmHg,PaO250mmHg,该患者出现呼吸衰竭加重的诱因为()。
A.急性呼吸道感染
B.使用镇静剂
C.吸高浓度氧
D.精神过于紧张
E.以上全是
Stop wasting your time on the wrong mountain
I have two friends who are backpackers. There is a portion of New York’s Adirondack Mountains called the High Peaks region. It is made up of 46 mountains with a___1____ of over 4,000 feet.
The Adirondack Mountain Club gives special honor and a patch to 2 who climbs all 46 mountains. My two friends decided to go for this 3 . It took them several years to accomplish it.
My friends had climbed 10 of the mountains. The left one was the farthest, 4 much effort. A hiking trail led past the base of the mountain, 5 from that point they were on their own.
Early one morning they left their 6 and walked 5 miles on the hiking trail to the base of a 7 of mountains. One of the mountains in this chain was the last one they 8 for their patch.
When they reached the base of the mountain chain they 9 that they had left their compass and map back in the camp. 10 returning to the camp, they decided to go on without them.
For hours they 11 uphill suffering heat and black flies. Finally, late in the afternoon they 12 themselves on the top of a mountain. They were tired but 13 .
The excitement was short-lived however. When they 14 the valley, they saw another higher mountain. They had climbed the 15 hill! It was too late that weekend to correct their 16 . They had to wait another 4 months to climb the right mountain.
This story 17 that often in life we make effort toward a 18 but without the right map and personal compass it is easy to get 19 .
Knowing your life purpose gives you a 20 personal map and compass. And that makes sure you are always climbing the right mountain.
1. A. length B. height C. width D. depth
2. A. something B. someone C. anything D. anyone
3. A. fame B. award C. medal D. gift
4. A. requiring B. making C. wasting D. paying
5. A. and B. even C. so D. but
6. A. village B. house C. camp D. cottage
7. A. series B. lot C. chain D. kind
8. A. needed B. prepared C. looked D. hunted
9. A. understood B. thought C. forgot D. discovered
10. A. Instead B. Rather than C. In case of D. In spite of
11. A. rushed B. rolled C. walked D. ran
12. A. relaxed B. congratulated C. enjoyed D. found
13. A. excited B. surprised C. disappointed D. puzzled
13. A. looked for B. looked across C. looked on D. looked through
15. A. high B. right C. wrong D. small
16. A. direction B. wrong C. decision D. error
17. A. provides B. brings C. offers D. proves
18. A. choice B. goal C. promise D. result
19. A. hurt B. separated C. lost D. bothered
20. A. beautiful B. famous C. expensive D. powerful
体育运动中包含了丰富的力学知识,如图所示,举重运动员举起质量120kg的杠铃,双臂夹角为120°,则运动员两臂对杠铃的作用力为(g=10m/s2)( )
A.750N
B.800N
C.1000N
D.1200N
从原料、外购件投入生产起,到经检验合格办完入库手续之前,存在各环节的零、部件都称为()。
A.原料
B.外购件
C.在制品
D.半成品
影响防护热板法重复性的因素()。
A、操作人员
B、不同设备
C、不同方法
D、试验条件