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问题 单项选择题

在频率为50MHz的工科医辐射设备附近，职业工作者可以在小于（）的磁场下8小时连续工作。

A、1.6A/m

B、2.6A/m

C、16A/m

D、160A/m

答案

参考答案：A

句型转换

句型转换。

1. The plane will get to Guangzhou in half an hour. (改为同义句) 

    The plane will _________ _________ Guangzhou in half an hour.

2. It's an awful talk show. (改为感叹句)

     _________ _________ awful talk show!

3. She wears colorful clothes because she wants to be young and beautiful. (对画线部分提问) 

    _________ _________ she wear colorful clothes?

4. We had a good time playing in the waves. (改为同义句)

    We had _________ _________ in the waves.

5. They had some delicious seafood this evening. (改为否定句)

    They _________ _________ any delicious seafood this evening.
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单项选择题

树的基本遍历策略可分为先根遍历和后根遍历；二叉树的基本遍历策略可分为先序遍历、中序遍历和后序遍历。这里，把由树转化得到的二叉树叫做这棵树对应的二叉树。结论______是正确的。

A．树的先根遍历序列与其对应的二叉树的先序遍历序列相同

B．树的后根遭历序列与其对应的二叉树的后序遍历序列相同

C．树的后根遍历序列与其对应的二叉树的中序遍历序列相同

D．树的先根遍历序列与其对应的二叉树的中序遍历序列相同
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