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【单选题】
对于Y型接法的电动机，相电压与线电压的关系为：（ ）。A.
相电压等于线电压
B.
相电压等于线电压的√3倍
C.
线电压等于相电压的√3倍
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【简答题】简述转基因食品安全性评价的主要内容。
【简答题】简述转基因食品安全性评价的方法。
【单选题】On the first day of school, Nemo gets stuck. After helping Nemo to get out, Marlin asks Nemo a few questions in a row to .
A.
test whether Nemo is a clever boy
B.
make fun of Nemo
C.
check whether Nemo is not hurt
D.
check whether Nemo previews lessons
【单选题】两等宽的圆柱体接触，其直径d1=2d2，弹性模量E1=2E2，则其接触应力值为____。
A.
σ H1 = σ H2
B.
σ H1 =2 σ H2
C.
σ H1 =4 σ H2
D.
σ H1 =8 σ H2
【简答题】阅读理解。 A Teacher's Lesson When Mrs. Thompson stood in front of her 5th grade class on the very first day of school, she told the children a lie. Like most teachers, she looked at her students and said ...
【简答题】简述转基因食品的安全性评价。
【简答题】完形填空。 My name is Lucy. I'm a __ 1 __ . I'm American. I'm at school now. My teacher is a __ 2 __ . Her name is Wang Pei. She is an __ 3 __ teacher. David is my friend. He is English. He is four. Da...
【单选题】两等宽的圆柱体接触，其直径d1=2d2，弹性模量E1=2E2，则其接触应力值为()。
A.
sH1=sH2
B.
sH1=2sH2
C.
sH1=4sH2
D.
sH1=8sH2
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