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问题
单项选择题
板纵断面呈悬链形，结构简单，施工方便，节约钢材，用薄钢板制成的储罐为（）。
A．无力矩顶储罐
B．拱顶储罐
C．浮顶储罐
D．套顶储罐
答案
参考答案：
A
填空题
用“进一法”把9.91凑整到十分位是______．
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填空题
用所给短语的正确形式填空。
take off, take away, give out, give in, give away
1. After a month their food supplies ______.
2. She's a gusty (勇敢的) player; she never ______.
3. These books must not ______ from the library.
4. He ______ most of his money to charity.
5. The plane ______ on time in spite of fog.
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