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【单选题】

$\lim_{x\to 3^+} \, \frac{3}{\left| x-3\right| }$

A.
$+\infty$
B.
$-\infty$
C.
1
D.
-1
举报
参考答案:
D
参考解析:
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举一反三

【单选题】In _____, nodding your head up and down means “yes”, while in some parts in ______, this motion can mean “no.” But in ______, nodding your head is a polite way to say “I heard you.”

A.
the United States; southeast Asia and China; Greece and Turkey;
B.
Greece and Turkey; southeast Asia and China; the United States;
C.
the United States; Greece and Turkey; southeast Asia and China
D.
Greece and Turkey; the United States; southeast Asia and China

【单选题】$\arctan (-\sqrt{3})=$

A.
$-\frac{\pi}{3}$
B.
$\frac{\pi}{6}$
C.
$\frac{\pi}{3}$
D.
$-\frac{\pi}{6}$

【单选题】下面方程的图像是函数的是

A.
$x^2+y^2=1$
B.
$x^4+y^4=1$
C.
$\sin (xy)=\frac{1}{2}$
D.
$|x+1|+|y-1|=0$

【单选题】$\lim_{x\to 0} \, \frac{\sqrt{x+3}-\sqrt{3}}{x}$

A.
$\frac{1}{2 \sqrt{3}}$
B.
$\frac{1}{ \sqrt{3}}$
C.
${2 \sqrt{3}}$
D.
${\sqrt{3}}$

【多选题】人类婚姻的发展类型:经历了乱伦婚以及:()

A.
伙伴婚
B.
对偶婚;
C.
.一夫一妻制;
D.
同性婚姻。