【简答题】W7812的输出电压为___,最大输出电流为___。
【单选题】由三端稳压器W7812组成的稳压电路如图所示,已知R1=R2=200W,Rp=100W,输出电压VO的最大值VOmax和最小值VOmin分别为______。【图片】【图片】
【判断题】Sony vegas 的字幕中无法实现文字背景的渐变色填充。
【多选题】在销售过程中,如果出现没有15W/30CC柴油机油时,可以用( )来代替。
【简答题】(2qq9?攀枝花) 2 w +( 地 7 + 1 2 )× 7 25 . w 地 × 1w 15 + 1 地 × 1w 15 . ( 5 1 w + 2 1 6 )÷(1- w 地 × 1 w ) 2 5 ×5+ 地 7 ÷地. 1 地 ×2+8÷ 地 5 + 1 5 .
【单选题】Questoion12 and 15 will be based on thefollowing new item.
A.
People who have the courage to face up to life’s challenges.
B.
People who have plenty of money.
C.
People who have good luck.
D.
People who are kind and willing to help others.
【单选题】Questoion12 and 15 will be based on thefollowing new item.
A.
He complained about his misfortune all day long.
B.
He picked up his interest to fight with misfortune.
C.
He established a website to share his experience.
D.
He applied for a job as a columnist for newspapers.