问题
单项选择题
闸阀的使用特点是（）
A、密封性能好，流动阻力小，适用于切断物料
B、密封性能好，流动阻力小，适用于流体流量调节
C、密封性能差，流动阻力大，适用于物料切断
D、密封性能差，流动阻力大，适用于流体流量调节
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
闸阀的使用特点是（）
A、密封性能好，流动阻力小，适用于切断物料
B、密封性能好，流动阻力小，适用于流体流量调节
C、密封性能差，流动阻力大，适用于物料切断
D、密封性能差，流动阻力大，适用于流体流量调节
参考答案：A
Passage Four
Which of the following is NOT mentioned as the reason for scammers to go after home computers a. Because of the data that contain credit card information. b. Because of the data that contain social security numbers. c. Because of the machines that control the high speed linkds which in mm can be used for spamming, and fraud. d. Because of less protection of home computers.