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【单选题】
Frequent exposure to X-ray is harmful, so the use of X-ray should be limited to occasions when______.A.
primary
B.
elementary
C.
necessary
D.
emergent
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反馈参考答案：
举一反三
【单选题】样本含量对误差影响的描述,正确的是 ()
A.
样本越大，系统误差越大
B.
样本越大，抽样误差越小
C.
样本越大，标准误越大
D.
样本越大，系统误差越小
E.
以上说法均不正确
【简答题】She can't tolerate noise of any sort when she’s trying to write.
【单选题】-What’s Laura going to do when she leaves school? -Until a few months ago, she was thinking of going to university, but she’s changed her mind. Now she believes she’s going to make it in the pop world...
A.
How do you feel about that?
B.
What’s she doing just now?
C.
What makes her change her mind?
D.
She’s doing great in the pop world.
【单选题】What troubles did Laura have when she’s ready for college?
A.
She didn’t have enough money for college.
B.
She just didn’t want to go to college.
C.
She’s still confused ( 困惑 ) about her future.
D.
She wanted to work.
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