The key to the industrialization of space is the U.S. space shuttle.______ it, astronauts will be able to fly into space and returning many times.

多选题

What is the key to business success?

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问答题

It was on the(　　)to the station that she lost her key.(　　) 第1空:way

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单选题

During class, the teacher leads students to memorize the important points of the teaching content. On one hand, the teacher helps students to grasp the key points. On the other hand, what learning strategy is the teacher teaching?

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单选题

The my_table table has an existing primary key. You want my_id to become the new primary key. Which statement will replace the old primary key with the new one?

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问答题

Since the key has lost

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