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【简答题】
如图，AB为圆O的直径，PA为圆O的切线，PB与圆O相交于D，若PA=3，PD：DB=9：16，则PD=______，AB=______．
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反馈参考答案：
举一反三
【单选题】如下对于字符串拼接有误的是（）
A.
“life is short,””you need python.”
B.
“life is short,”+”you need python.”
C.
“life is short,” 2*”you need python.”
D.
“life is short,”+2*”you need python.”
【单选题】__________ seeing the damage he had done，the child felt ashamed．
A.
Bv
B.
On
C.
At
D.
For
【单选题】如下对于字符串拼接有误的是( )
A.
“Life is short，”“you need Python”
B.
“Life is short，”+“you need Python”
C.
“Life is short，”2*“you need Python”
D.
“Life is short，”+2*“you need Python”
【简答题】我想要申请去前台交叉培训。
【单选题】______ seeing the damage he had done, the child felt ashamed.
A.
By
B.
On
C.
At
D.
For
【单选题】Linda felt someone ________ on her way home from work yesterday evening, and therefore she was frightened and looked back from time to time.
A.
followed
B.
would follow
C.
had followed
D.
was following
【简答题】________ seeing the damage he had done, the child felt ashamed. A) By B) On C) At D) For
【单选题】在字符串模板及其拼接中,下面那些描述是错误的?
A.
符号$后面跟变量名，系统会自动匹配最长的变量名。
B.
下面这行代码，输出的是变量test_origin_trim的值，而不是test的值： println( " $test_origin_trim" )
C.
在Kotlin格式化代码中，美元符号$属于特殊字符，因此,在很多情况下，不能直接打印它，必须经过转义才可以打印。
D.
有如下代码;println( "美元金额为 ${'$'}$sorigin")，该语句输出的是：美元金额为：'$'$sorigin
【单选题】对于字符串拼接有误的是（ ）。
A.
“Life is short， “ “you need Python.”
B.
“Life is short， “ + “you need Python.”
C.
“ Life is short， “ 2 * “you need Python.”
D.
“Life is short， “ + 2 * “you need Python.”
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