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【单选题】
进行各种( )试验时,要在制定的安全栅栏内进行,并挂好“高压试验,危险!”和“不准入内”等警告标语。A.
高压
B.
低压
C.
绝缘
D.
耐压
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举一反三
【单选题】Water and oil do not mix because:( )
A.
The density of water is bigger than oil
B.
hydrocarbon molecules are non-polar and can not interact strongly with water molecular
C.
The density of oil is bigger than water.
D.
不知道
【单选题】下面程序段中，_______ 可以将图片lena.bmp保存为JPEG格式。
A.
image = Image.open("lena.bmp") image.save("lena.jpg")
B.
image = Image.open("lena.jpg") image.save("lena.bmp")
C.
image.open("lena.jpg") image.save("lena.bmp")
D.
Image.open("lena.bmp") Image.save("lena.jpg")
【简答题】某种种子的发芽的概率都为0.9，现播种了1000粒，对于没有发芽的种子，每粒需要再补种2粒，补种的种子数记 为X，则X的数学期望为=
【单选题】An oil water monitor is required in order to measure _______.
A.
the oil content in water
B.
the water level in bilge well
C.
the water content in fuel oil
D.
the oil level in bilge well
【单选题】某种种子每粒发芽的概率都为0.9,现播种了1 000粒,对于没有发芽的种子,每粒需再补种2粒,补种的种子数记为X,则X的期望为( )(提示:二项分布的期望为 )
A.
100
B.
200
C.
300
D.
400
【单选题】An oil water monitor is required in order to measure _____.
A.
the oil content in water
B.
the water content in fuel oil
C.
the water level in bilge well
D.
the oil level in bilge well
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