在允许的条件下用()直径的热风阀,对延长热风阀寿命有利。A.小 B.大 C.均可 D

题型:单项选择题

问题:

在允许的条件下用()直径的热风阀,对延长热风阀寿命有利。

A.小

B.大

C.均可

D.无关

考点:炼铁工考试炼铁原理炼铁原理题库
题型:单项选择题

氨气是工业上制备硝酸的重要原料,也经常用于合成铵盐制造化肥。氨气密度比空气小,极易溶于水且能与水发生反应。下图中可用于实验室收集氨气的装置是

 

题型:单项选择题

一轻杆一端固定质量为m的小球,以另一端O为圆心,使小球在竖直平面内作半径为R的圆周运动,则[ ]

A.小球过最高点时,杆所受弹力可以为零

B.小球过最高点时的最小速度是

C.小球过最高点时,杆对球的作用力可以与球所受重力方向相反

D.小球过最高点时,杆对球的作用力一定跟小球所受重力的方向相反

题型:单项选择题

票据贴现的期限最长为( )个月。

A.3

B.6

C.9

D.12

题型:单项选择题

—_____ does it take you to finish your homework every day?

—About an hour.  [ ]

A. How much   

B. How long      

C. How soon       

D. How often

题型:单项选择题

Are teens and young adults more narcissistic (自恋的) today than in the past That’s the view of a California researcher who studies (1) people.

In her new book, The Narcissism (2) : Living in the Age of Entitlement, psychologist Jean Twenge of San Diego State University and (3) W. Keith Campbell of the University of Georgia say research shows (4) young people today have "narcissistic traits" than in (5) generations. Such traits, Twenge says, include a very. (6) and inflated sense of self, which is (7) by a preoccupation with MySpace, Facebook and YouTube.

"We’ve been on this self-admiration cultural (8) for a long time," Twenge says. (9) Twenge’s take on today’s young people isn’t universal. Studies by other researchers, including Canadian (10) Dr. Kali of the University of Western Ontario, have used the same data but found (11) results. "They put a different (12) on it," Kali says.

Twenge’s studies have found more narcissistic traits and a (13) rate of increase among college students today, but Kali found that students’ narcissism was (14) greater in 2006 than in 1976. Twenge’s most recent paper studied the same data as Kali--more than 20 000 college students from 2002 to 2007. (15) researchers used the Narcissistic Personality Inventory to measure narcissistic (16) and findings by both have been (17) in peerreviewed journals.

Twenge’s book (18) just a month after The Mirror Effect : How Celebrity Narcissism Is Seducing America, a book co-written by behavioral (19) Drew Pinsky, (20) suggested that a celebrity-obsessed culture is causing more narcissism.

4()

A.less

B.more

C.decreasing

D.many

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