吊箱围堰封底水下砼的厚度，应按抽水时围堰不上浮和砼强度应满足受力要求的原则计算确定，但不得小于（）m.
A、0.5
B、1
C、1.5
参考答案：B
多层螺旋CT是指
A．可同时重建多个层面图像的CT设备
B．可同时采集多个层面数据的CT设备
C．可同时显示多个层面影像的CT设备
D．可同时存储多个层面影像数据的CT设备
E．可同时处理多个层面影像数据的CT设备
句型转换。
1. It is a box. (改为复数形式)
They _____ _____.
2. It's time to have lunch, Jenny. (改为同义句)
It's time _____ ______ Jenny.
3. Li Ming does some housework at home. (改为否定句)
Li Ming do housework at home.
4. My father walks to work.(改为同义句)
My father goes to work _______ _______.
5. This orange is orange. (改为同义句)
This is _______ orange _______.
