下面有五个命题:①函数y=sin4x-cos4x的最小正周期是π.②终边在y轴上

题型:填空题

问题:

下面有五个命题:
①函数y=sin4x-cos4x的最小正周期是π.
②终边在y轴上的角的集合是{a|a=
2
,k∈Z
|.
③在同一坐标系中,函数y=sinx的图象和函数y=x的图象有三个公共点.
④把函数y=3sin(2x+
π
3
)
的图象向右平移
π
6
得到y=3sin2x的图象
⑤函数y=sin(x-
π
2
)
在(0,π)上是减函数
其中真命题的序号是______((写出所有真命题的编号))
考点:函数y=Asin(wx+φ)的图象与性质
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在“探究电阻上的电流跟两端电压的关系”实验中,定值电阻R=50Ω,电源电压保持不变.

(1)小明根据电路图连接了如图甲所示的实验电路,检查时发现有一根导线连接有误.请在这根导线上打“×”,并用笔画线代替导线,画出正确的连线(导线不得交叉).

(2)电路改正后,开始进行实验,小明根据测出的数据,画出了电阻的U﹣I关系图象,如图乙所示,由图象可以得出结论:___________________________________;为了使结论更具有普遍性,小明还应该 ________________________________。

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比较起来下面哪种烧水方法不利于节能?()

A.用电水壶烧水

B.用电饭锅烧水

C.用煤气烧水

D.用电磁炉烧水

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男性,35岁,稍长距离步行后感右小腿疼痛、肌肉抽搐,稍休息后症状消失,平时感右足发凉、怕冷,有麻木感。右足背动脉搏动减弱。应考虑()

A.深静脉血栓形成

B.血栓性静脉炎

C.血栓闭塞性脉管炎(营养障碍期)

D.血栓闭塞性脉管炎(局部缺血期)

E.动脉粥样硬化症

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A variety of illegal acts committed by people in the course of their employment, for their own personal gain, are collectively known as white-collar crime. Embezzlement, theft and trading securities (1) insider information are common forms of white-collar crime. The majority of cases involve low-level employees who steal because they are under (2) financial stress. Many plan to (3) the money back as soon as possible but may never do so. Their crimes are usually never (4) because the amounts of money are small, and no one notices the (5) .

(6) , there are some very large cases of white-collar crime, such as multimillion-dollar stock market or banking seams that take years to discover and are extremely difficult and expensive to (7) .

White-collar crime is not (8) to the business sector. Government employment, especially (9) the city level, also provides opportunities to (10) one’s pockets. (11) , building inspectors accept bribes and full-time employees receive (12) payments.

Although white-collar crime is less (13) than street crime, it involves (14) more money and harm to the public than crimes committed by street criminals. It is (15) that there are more criminals (16) the office suites than in the streets, yet the (17) of white-collar makes it difficult to uncover the offenses and pursue the offenders. As the economy (18) from manufacturing to services and electronic commerce, opportunities for white-collar crime (19) , while the technology needed to stop such crimes will (20) .

8()

A.restrained

B.constrained

C.confined

D.bound

题型:填空题

我国的《公路沥青路面再生技术规范》建议水泥等活性填料一般不超过()

A.1%

B.1.5%

C.2%

D.2.5%

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