【单选题】【消耗次数：1】
Tom has been a vegetarian ____ principle for years.
①
in
②
on
③
for
④
by
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相关题目
【单选题】
he park has been built and it will be open _____ three years
①
A. in
②
B.for
③
C.on
④
D.after
【单选题】
The professor has been [填空]at the university for over thirty years.
①
teach
②
taught
③
teaching
④
will teach
【单选题】
Lucy has been a student there for nearly one and [填空] half years．
①
a
②
an
③
the
④
/
【单选题】
This technology has been ?around for a long time, but not until recent years _______ it in marketing.
①
businesses employed
②
did businesses employ
③
businesses had employed?
④
had businesses employed
【单选题】
38. In recent years much more emphasis has been put______ developing the students productive skills.
①
onto
②
in
③
over
④
on
【单选题】
Our factory has ____ for years.
①
many fire equipments
②
much equipment of fire
③
many equipments of fire
④
much fire equipment
随机题目
【多选题】
在Photoshop中, 下面对图层蒙版的描述哪些是正确的？
①
图层蒙版相当于一个8位灰阶的Alpha通道
②
当按住Alt键单击图层面板中的蒙版缩略图，图像中就会显示蒙版
③
在图层面板的某个图层中设定了蒙版后，同时会在通道面板中生成一个临时Alpha通道
④
在图层上建立蒙版只能是白色的
【多选题】
Photoshop中下面对背景层的描述哪些是正确的?
①
背景始终是在所有图层的最下面
②
可以将背景转化为普通的图层，但是名称不能改变
③
背景转化为普通的图层后，可以执行图层所能执行的所有操作
④
背景不可以转化为普通的图层
【多选题】
Photoshop中下面对通道的描述哪些是正确的?
①
图像的通道数量是由图像的存储格式而决定的
②
图像的通道数量是由图像的色彩模式而决定的
③
同一图像的所有通道都有相同数目的像素点和分辨率
④
在图像中可增加无限多个Alpha通道
【单选题】
一般来说，声音的质量要求越高，则_______。
①
量化位数越低和采样频率越低
②
量化位数越高和采样频率越高
③
量化位数越低和采样频率越高
④
量化位数越高和采样频率越低
【简答题】
Direction: Fill in the blanks with the words given below. Change the form if necessary.[vain; frame; curve; twist; comb; collapse; scatter; scratch; rebuild; harsh]7. Why do you hirple and where did you[填空1]your foot?
【简答题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]6. We[填空1]hearing from you soon.
【简答题】
设连续型随机变量X的分布函数为:F(x)=A+Barctanx (<img class="jc-formula" data-tex="x\in R" src="https://huaweicloudobs.ahjxjy.cn/E6257F25E8847B62C6B54566D17B631B.png" style="vertical-align: middle;"/>)（1）求常数A和B；（2）计算P{-1X≤1}。
【简答题】
设A，B是两个事件，P(A)=0.4，<img class="jc-formula" data-tex="P(A\cup B)=0.7" src="https://huaweicloudobs.ahjxjy.cn/EFBA9754CDC5D9C5BCC7503754E44E53.png" style="vertical-align: middle;"/>，当A，B不相容时，P(B)=[填空1]
【简答题】
设在每次试验中，事件A发生的概率为p,则在n次独立重复试验中，事件A至少发生一次的概率是[填空1]