给出下列命题:①存在实数α,使sinαcosα=1;②存在实数α,使sinα+c

题型:填空题

问题:

给出下列命题:①存在实数α,使sinαcosα=1;
②存在实数α,使sinα+cosα=
3
2

y=sin(
2
-2x)
是偶函数;
x=
π
8
是函数y=sin(2x+
4
)
的一条对称轴方程.
其中正确命题的序号是 ______
考点:正弦、余弦函数的图象与性质(定义域、值域、单调性、奇偶性等)函数y=Asin(wx+φ)的图象与性质
题型:填空题

下列词语中,没有错别字的一组是(  )

A.订正返聘绩优股焕然冰释

B.飙升篡夺口头禅暗渡陈仓

C.融资家具掉书袋雍荣华贵

D.桥墩羸弱撒手锏错堪贤愚

题型:填空题

Before, whenever we had wealth, we started discussing poverty. Why not now Why is the current politics of wealth and poverty seemingly about wealth alone Eight years ago, when Bill Clinton first ran for president, the Dow Jones average was under 3,500, yearly federal budget deficits were projected at hundreds of billions of dollars forever and beyond, and no one talked about the "permanent boom" or the "new economy." Yet in that more straitened time, Clinton made much of the importance of "not leaving a single person behind." It is possible that similar "compassionate" rhetoric might yet play a role in the general election.
But it is striking how much less talk there is about the poor than there was eight years ago, when the country was economically uncertain, or in previous eras, when the country felt flush. Even last summer, when Clinton spent several days on a remarkable, Bobby Kennedy-like pilgrimage through impoverished areas from Indian reservations in South Dakota to ghetto neighborhoods in East St. Louis, the administration decided to refer to the effort not as a poverty tour but as a "new market initiative."
What is happening is partly a logical, policy-driven reaction. Poverty really is lower than it has been in decades, especially for minority groups. The most attractive solution to it — a growing economy — is being applied. The people who have been totally left out of this boom often have medical, mental or other problems for which no one has an immediate solution. "The economy has sucked in anyone who has any preparation, any ability to cope with modem life," says Franklin D. Raines, the former director of the Office of Management and Budget who is now head of Fannie Mae. When he and other people who specialize in the issue talk about solutions, they talk analytically and on a long-term basis: education, development of work skills, shifts in the labor market, adjustments in welfare reform.
But I think there is another force that has made this a rich era with barely visible poor people. It is the unusual social and imaginative separation between prosperous America and those still left, out... It’s simple invisibility, because of increasing geographic, occupational, and social barriers that block one group from the other’s view.

Which statement from the passage is an opinion

A.Another force has made this a rich era with barely visible poor people.

B.Clinton’s tour was called a "new market initiative."

C.Poverty really is lower than it has been in decades.

D.Eight years ago, the Dow Jones average was under 3,500, and yearly federal budget deficits were projected at hundreds of billions of dollars.

题型:填空题
如图为理想变压器原线圈所接交流电压的波形.原、副线圈匝数比n1:n2=10:1,串联在原线圈电路中电流表的示数为1A,下列说法正确的是(  )

A.变压器输出端所接电压表的示数为20V

B.变压器的输出功率为200W

C.变压器输出端的交流电的频率为50Hz

D.穿过变压器铁芯的磁通量变化率的最大值为20/n2Wb/s

题型:填空题

成为沟通人的感性与理性的桥梁的是

A.智育

B.体育

C.美育

D.德育

题型:填空题

以下哪些设备通过1350OMS的TL1+SNMP组合进行管理?()

A、1850TSS-320R3.x

B、1850TSS-160

C、1678MCC

D、ISA

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