问题
单项选择题
当液压油流速过高，压力损失严重导致的齿轮泵过热时，应采取的措施是（）。
A.增大油箱的容积或者改善油箱的冷却条件
B.加粗油管
C.改进卸荷方法，减少泵带压溢流时间
D.增加冷却能力或重新调整，确保供水量
答案
参考答案：B
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当液压油流速过高，压力损失严重导致的齿轮泵过热时，应采取的措施是（）。
A.增大油箱的容积或者改善油箱的冷却条件
B.加粗油管
C.改进卸荷方法，减少泵带压溢流时间
D.增加冷却能力或重新调整，确保供水量
参考答案：B
根据短文内容，用方框中所给单词的适当形式填空。每词限用一次。
Today, SMS—Short Message Service is popular, and China Mobile says that every second, there are 410 messages being sent. Look ___3____you! People are watching their mobiles, smiling or laughing. Thumbs（拇指） that the short strong fingers are moving quickly on mobiles, bringing happiness to their friends. Through SMS, we know the weather report, share jokes and news, show __4_____and friendship. SMS is becoming more and more popular. It is reported that 67% of young people like to send short messages to greet each other. Internet SMS will be more __5_____to people. I am thankful for SMS because it saves me much money. Just on the top end of a thumb, so much joy can be found! |