问题
单项选择题
一般腐蚀性介质的低压容器常采用（）板垫片。
A、橡胶
B、石棉橡胶
C、石棉
D、聚乙烯
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
一般腐蚀性介质的低压容器常采用（）板垫片。
A、橡胶
B、石棉橡胶
C、石棉
D、聚乙烯
参考答案：C
完型填空（共20小题；每小题1分，满分20分） 阅读下面短文，从短文后所给各题的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。 I have two friends who are eager to go hiking. There is a High Peaks region 1 46 mountains in New York. A mountain club gives special recognition（奖赏） to 2 who climbs all the 46 mountains. My two friends decided to go for this 3. The mountains were really 4 to climb. It 5 them several years to achieve it. My friends had climbed 45 of the mountains, and the 6 one was the most distant and the highest. Early one morning they left their campsite hiking path to the 7 of a chain of mountains. When they reached the base, they found that they had left their 8 and map in the camp. 9 returning to the camp, they decided to navigate(导航，定位) without them. 10, they reached the top of a mountain. They were worn-out 11 extremely happy. However, the 12 lasted only for a short time. When they 13 , they saw another higher mountain. They had climbed the 14 mountain! 15 the time problem, they had to wait for another four months to climb the right mountain. I think this story tells an important 16：often in life we put great 17 into some of our goals, but without the right map and compass, it is easy to get 18. Knowing your 49 in life gives you a powerful personal map and compass, 20 that you are always climbing the right mountain.
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缺失，
单端固定桥（无
），戴2年余，近期自觉基牙松动，冷热疼痛不适，查：
松动Ⅰ度，固位体面穿孔，深龋洞，边缘不密合，牙龈充血，红肿