iPhone用户可以使用哪项iOS7功能来查看显示天气、交通状况和日历事件的今日摘要?()
A.Launchpad
B.控制中心
C.通知中心
D.Dock
参考答案:C
-I am very worried about tomorrow's maths test.I am afraid I can't pass this time.
-_______!I'm sure you'll make it.[ ]
A.No problem
B.That's right
C.Cheer up
D.Don't mention it
水泥细度筛析时,应调整负压范围在4000-6000Pa之间,连续筛析3min,当负压小于4000Pa时,应清理吸尘器内的水泥至负压正常。