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how long do you think it will be___china sends a manned spaceship to the moon?

分类: 作业答案 • 2021-12-28 15:49:01

问题描述：

how long do you think it will be___china sends a manned spaceship to the moon?
a when
b before
用哪个?

答

B before
因为跟的是一段时间(HOW LONG)
如果用when要跟确切的时刻

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how long do you think it will be___china sends a manned spaceship to the moon?
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How long do you think it will be __ China sends a manned spaceship to the moon?
How ong do you think it will be before China sends a manned spacceship to the moon?
集合A={x|x2-2x-3≤0，x∈R}B={x|x2-2mx+m2-4≤0，x∈R，m∈R}． ①若A∩B=[0，3]，求实数m的值； ②若A⊆CRB，求实数m的取值范围； ③若m=3，试定义一种新运算A△B，使A△B={x|3＜x≤5
2的（以4为底的12的对数）次方减3的（以9为底的27的对数）次方加5的（以25为底三分之一的对数）次方的值