题干

若复数是纯虚数(是虚数单位,是实数),则( )

A:-2

B:

C:

D:2

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答案(点此获取答案解析)

D

同类题1

阅读下面的文言文,完成下面小题。

    周沆,字子真,青州益都人。第进士,知渤海县。岁满,县人请留,既报可,而以亲老求监州税。通判凤翔,初置转运判官。沆使江西,求葬亲,改知沂州。历开封府推官。

    湖南蛮唐、盘二族寇暴,杀居民,官军数不利,以沆为转运使。沆言:“蛮骤胜方骄,未易斗力,宜须秋冬进兵。且其地险气毒,人骁悍,善用鋋盾,北军不能确。请选邕、宜、融三州卒三千人习知山川技艺者,径捣其巢,布余兵络山足,出则猎取之。俟其势穷力屈,乃可顺抚。”朝廷用其策,二族皆降。加直史馆、知潭州。他道兵来戍者,率两期乃代,多死瘴疠,沆请以期为断,戍人便之。

    徙河东转运使。民盗铸铁钱,法不能禁,沆高估钱价,铸者以无利,自息。入为度支副使。

    侬智高乱定,仁宗命安抚广西,谕之曰:“岭外地恶,非贼所至处,毋庸行。”对曰:“君命,仁也;然远民罹涂炭,当布宣天子德泽。”遂往,遍行郡邑。民避寇弃业,吏用常法,满半岁则听人革佃。沆曰:“是岂与凶年诡征役者同科?”奏申其期。擢天章阁待制、陕西都转运使,改河北。

    李仲昌建六塔河之议,以为费省而功倍。诏沆行视,沆言:“近计塞商胡本度五百八十万工用薪刍千六百万今才用功一万薪刍三百万均一河也而功力不相侔如是盖仲昌先为小计以来兴役尔。况所规新渠,视河广不能五之一,安能容受?此役若成,河必泛溢,齐、博、滨、棣之民其鱼矣。”既而从初议,河塞复决,如沆言。

    进枢密直学士、知成德军。俗方弃亲事佛。沆阅按,斥数千人还其家。以户部侍郎致仕,卒,年六十九。

(选自《宋史•卷三百三十一•列传第九十》)

同类题3

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      Sure, it's good to get along with your teacher because it makes that time you spend in the classroom more pleasant. And yes, it's good to get along with your teacher because, in general, it's smart to learn how to relate to the different types of people you'll meet throughout your life.

      But really, there's one super-important reason why you should get along with your teacher. Kids who get along with their teachers not only learn more, but they're more comfortable asking questions and getting extra help. This makes it easier to understand new material and do your best on tests. When you have this kind of relationship with a teacher, he or she can be someone to turn to with problems, such as problems with learning or school issues, such as bullying.

       As a kid in elementary or middle school, you're at a wonderful stage in your life. You're able to take in lots of new and exciting information. Apart from that, you're able to think about all this information in new ways. Your teacher knows that, and in most cases, he or she is thrilled to be the person who's giving you all that material and helping you put it together. Remember, teachers are people, too, and they feel great if you're open to what they're teaching you. That's why they wanted to be teachers in the first place to teach!

       Some kids may be able to learn in any situation, whether they like the teacher or not. But most kids are sensitive to the way they get along with the teacher, and if things aren't going well, they won't learn as well and won't enjoy being in class.