【简答题】( 1)二次根式的概念:一般地,我们把形如 的式子叫作二次根式 . “____”称为二次根号. ( 2)二次根式的双重非负性:二次根式的被开方数为________数,二次根式的值为_________数.
【单选题】(2013)患者,男,28岁。在大排档聚餐后出现高热、腹泻,诊断为细菌性痢疾。对该患者采取的护理措施中,不正确的是
【单选题】冷高压移动时常呈椭圆形,其长轴的走向通常可以表示:
【单选题】Which of the following is recommended as a way to deal with nervousness in your speeches?
A.
Concentrate on thinking about your stage fright.
B.
Think of your speech as an act of communication.
C.
Try to generate extra adrenaline as you speak.
D.
Work especially hard on your conclusion.
【单选题】Which of the following is not your cousin ?
A.
your mother's sister's son
B.
your father's sister's son
C.
your grandpa's another daughter's son
D.
your uncle's youngest sister
【单选题】当x=-3时,二次根式 的值为 ,则m等于 [ ]