在等差数列{an}中,a2=8,a5=64,则公差d为( ) A.2 B.3 C.56

题型:选择题

问题:

在等差数列{an}中,a2=8,a5=64,则公差d为(  )
A.2B.3C.
56
3
D.8
考点:等差数列的定义及性质等差数列的通项公式
题型:选择题

下面给出四种说法,其中正确的个数是(    )

①对于实数m和向量a、b,恒有m(a-b)=ma-mb;②对于实数m、n和向量a,恒有(m-n)a=ma-na;

③若ma=mb(m∈R),则a=b;④若ma=na(a≠0),则m=n.

A.1

B.2

C.3

D.4

题型:选择题

某患者2天前外感,体温38.6℃~39.2℃,曾服感冒冲剂及注射庆大霉素未效,第3天来诊,仍感恶风,身热汗出,咽喉红肿疼痛,鼻塞流涕,舌苔薄黄,脉浮而数,乃停用庆大霉素。求治于中医药。应选用下列何方治疗?()

A.荆防败毒散

B.银翘散

C.杏苏散

D.桑菊饮

E.麻黄汤

题型:选择题

轻瘫试验检查的临床意义有助于诊断()

A.锥体系病变

B.锥体外系病变

C.小脑病变

D.深感觉病变

E.浅感觉病变

题型:选择题

The International Whaling Commission’s (IWC) decision to retain its ban on whaling does not mean that the killings will stop. Quite the (1) .

Save the Whale. It’s a phrase which became annoying with (2) , an unfavorable shorthand for liberal consciences. How appalling, then, that in the year 2010, it should be pressed (3) service again, to fight the whaling nations: Norway and Iceland, who exempted themselves from the 1986 prohibition (4) by the IWC, and Japan, which hunts whales under cover of " (5) research".

I am completely (6) by this week’s events in Morocco, where talks broke down. In my heart, I agree with those who have (7) the news that this year’s negotiations of the IWC have broken up, and (8) the prohibition would not be lifted (as the US proposed in a desperate (9) to break the deadlock). Yet reason (10) something else. If we do not (11) some kind of new control, the (12) will be able to go on with their slaughter (13) . Membership of the IWC is (14) , and the ban was only ever intended to be (15) . Japan, which has been buying the votes of nations with no interest in whaling (only in the 16 Japan offers in turn), will continue to press its case, having invested millions of dollars in its (17) . Geoffrey Palmer, New Zealand’s Commissioner at the IWC, has proposed a year-long (18) period. In the meantime, more whales will die.

We stand at a crossroad for whales. We see the (19) existence of these animals as an indicator of ecological threat. As symbols of an endangered world, they evoke, and provoke, a feeling that they have the same qualities as human on a scale equal to their size and supposed (20) . To some this is so much sentimental words in the New Age.

19()

A.abundant

B.fragile

C.subtle

D.affluent

题型:选择题

辉光放电与弧光放电中,正柱区的发光较为明亮.且最均匀,电场强度是常数,但相对辉光放电,弧光放电的电场强度()。

A.更大

B.更小

C.不一定

D.相等

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