两个证券之间的相关系数为ρAB,以下说法正确的有()。A.ρAB值为正,表明这两种证

题型:多项选择题

问题:

两个证券之间的相关系数为ρAB,以下说法正确的有()。

A.ρAB值为正,表明这两种证券的收益有同向变动倾向

B.ρAB值为1,表明这两种证券存在完全同向的联动倾向

C.ρAB值为-1,表明这两种证券存在完全反向的联动倾向

D.ρAB值为0,表明这两种证券没有联动倾向

考点:证券从业资格考试第七章证券组合管理理论第七章证券组合管理理论题库
题型:多项选择题

左、右心室同时肥大的心电图诊断包括()。

A.有左心室肥大表现,但VsR/S<1电轴轻度右偏

B.有左心室肥大表现,电轴不偏

C.有右心室肥大表现,Rv5>2.5mV

D.左、右胸导联有双侧心室肥大的特征

E.有右心室肥大表现,电轴显著右偏

题型:多项选择题

RS-485接口的驱动能力不小于()个同类接口

题型:多项选择题
In 1898 an 8.2 earthquake almost flattened America, killing over 30,ooo people in less than four minutes. In the middle of complete damage and disorder, a father rushed to the school where his son was supposed to be,  26  that the building was  2 7.
After the unforgettably shock, he 28  the promise he had made to his son: “ No matter  29 happens, I’ll always be there for you!” And tears began to 30 his eyes. As he looked at the pile of ruins, it looked hopeless, but he kept remembering his 31  to his son. He rushed there and started 32 the ruins.
As he was digging, other helpless parents arrived , 33 : “It’s too late ! They are all dead! 34  , face reality; there’s nothing you can do!” To each parent he responded with 35 : “Are you going to help me now? ”No one helped. And then he continued to dig for his son, stone by stone.
Courageously he went on alone because he needed to know 36 : “Is my boy 37 or he is dead?” He dug for eight hours … 12 hours…36 hours…then , in  38  hour , he pulled back a large stone and heard his son’s 39 . He screamed his son’s name, “ARMAND!” He heard back, “Dad!?! It’s me, Dad! I told other kids not to worry.  I told them that if you were alive, you 40 me and 41 you saved me, they’d be saved. You promised, ‘No matter what happens, I’ll always be there for you!’ You did it, Dad!”
“What’s going on in there? ”the father asked
“There are 14 of  us  42 43  33,Dad. We’re scared, hungry, thirsty and thankful you are here. When the building collapsed, it made  44  , and it saved us.”
“Come out , boy!”
“No, Dad! Let the other kids out first, 45 I know you’ll get me! No matter what happens, I know you’ll always be there for me!”
小题1:
A.only discoveringB.only to discoverC.only realizingD.only to realize.
小题2:
A.as flat as a pancakeB.as high as a mountain
C.as strong as an ox D.as weak as a kitten
小题3:
A.memorized B.forgotC.keptD.remembered
小题4:
A.whatB.that C.whichD.who
小题5:
A.fillB.fill in C.comeD.burst
小题6:
A.pictureB.promiseC.presentD.encourage
小题7:
A.diggingB.digging throughC.digging outD.digging into
小题8:
A.to sayB.saidC.and sayingD.saying
小题9:
A.Come outB.Come againC.Come onD.Come off
小题10:
A.one wordB.one soundC.one rowD.one line
小题11:
A.for himselfB.of himselfC.by himselfD.to himself
小题12:
A.liveB.livingC.aliveD.lively
小题13:
A.38B.the 38C.38thD.the 38th
小题14:
A.soundB.voiceC.noiseD.tone
小题15:A will save       B. would  save   C. save          D. would have saved
小题16:
A.ifB.because C.even ifD.though
小题17:
A.remainedB.missingC.leftD.gone
小题18:
A.forB.behindC.out ofD.over
小题19:
A.a promiseB.spaceC.roomD.a triangle
小题20:
A.becauseB.thoughC.whenD.even though
题型:多项选择题

指出下列现象中能量之间的转化情况.

(1)植物进行光合作用:______

(2)电动机工作:______

(3)气体的膨胀做功:______

(4)摩擦起电:______.

题型:多项选择题

确定残髓炎最可靠的方法是()

A.温度测验

B.电活力测验

C.化学测验

D.探查根管深部

E.叩诊

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