问题
单项选择题
使用正扣可退式打捞矛打捞时，如落鱼卡死，需退出打捞矛时，只要给一定的下击力，再（），上提钻具即可退出落鱼。
A.正转钻具2～3圈
B.反转钻具2～3圈
C.直接上提钻具
D.先正转再反转
答案
参考答案：A
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使用正扣可退式打捞矛打捞时，如落鱼卡死，需退出打捞矛时，只要给一定的下击力，再（），上提钻具即可退出落鱼。
A.正转钻具2～3圈
B.反转钻具2～3圈
C.直接上提钻具
D.先正转再反转
参考答案：A
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! |