学校航模组人数是电脑组人数的45,电脑组人数是美术组的34,航模组有12人,美术

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问题:

学校航模组人数是电脑组人数的
4
5
,电脑组人数是美术组的
3
4
,航模组有12人,美术组有多少人?
考点:分数的四则混合运算及应用
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木耳(Auricularia)的有性孢子是:()

A.担孢子;

B.子囊孢子;

C.接合孢子;

D.卵孢子

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如图所示,AB是一质量为m的均匀细直杆,A端靠在光滑的竖直墙壁上,B端置于水平地面上,杆身与竖直方向夹角为θ,杆与地面的摩擦系数为μ,保持平衡,则此时杆与地面的摩擦力为(  )

A.mgtgθ

B.mgsinθ

C.μmg

D.μmg

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柴油发动机怠速游车的原因有()

A.与怠速无关

B.怠速过低

C.怠速过高

D.与发动机温度有关

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空调水系统的设计参数(考虑了安全因数)为:流量为100t/h,阻力为28m H2O。采用两台相同的水泵并联工作,水泵的扬程为28m,则单台水泵的流量应选择______。

A.不考虑水泵并联的流量衰减,水泵流量选50t/h
B.考虑水泵并联的流量衰减10%,水泵流量选56t/h
C.考虑水泵并联的流量衰减20%,水泵流量选63t/h
D.考虑水泵并联的流量衰减30%,水泵流量选72t/h

题型:解答题

True, some of the attacks against whites by blacks are for money and valuables. But, others ale revenge assaults by blacks for a real or imagined racial insult. It is equally true that the vast majority of violent crimes against whites are committed by whites, while the vast majority of violent crimes against blacks are committed by other blacks. Yet even after discounting crimes that are hastily and erroneously (错误地,不正确地) tagged as racially motivated, many blacks do attack whites because they all white. A 1998 Justice Department study confirmed that nearly 20% of the more than 4,000 hate crimes well committed against whites, and their attackers were blacks. The Southern Poverty Law Center also notes that there is a huge escalation in black-on- white violence from nearly none at the beginning of the 1990s.
A collection of white supermacists and rightist extremist groups have eagerly made black-on- white violence a wedge issue in their movement to paint blacks as the prime racial hate mongers in America. The New Century Foundation, an ultra-conservative think-tank, has launched a full- blown national campaign to alert whites to the danger of black hate crimes. These groups and individuals magnify hate crimes by blacks in order to back their social agenda. They oppose affirmative action programs and per hate crime laws. They downplay, or justify, the proliferation of white-supremacist-tinged paramilitary groups, police violence, and racial profiling. And they lobby hard for more prisons, police, and tougher laws.
Black-on-white violence also reinforces white fears of blacks as the ultimate menace to society. When blacks say or do nothing about these attacks, it is taken by some as a tacit signal that blacks put less value on white lives than black lives. This is a terrible price for black silence on hate crimes committed by blacks.

What can be inferred according to this passage

A. Some crimes are racially motivated.
B. All black people hate white people.
C. There’s racial discrimination only in America.
D. America is not a good place for immigrants for its serious black-on-white violence.

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