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问题 单项选择题

关于输血发生发热反应，不正确的是（）。

A、是最常见的早期输血并发症之一

B、多发生在输血开始后15分钟-2小时内

C、症状持续30分钟-2小时后逐渐缓解

D、全身麻醉时很少出现

E、血压多升高

答案

参考答案：E

句型转换

句型转换。

1.There are many cars and buses on the street. (改为一般疑问句)

                                                                                                    

2. She is reading a book. (就画线部分提问)

                                                                                                     

3. Jenny can fly a kite. (改为否定句)

                                                                                                     

4. He hurts his nose. (改为同义句) 

                                                                                                     

5. This is easy for me. (改为同义句)

                                                                                                     

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单项选择题

为强化煤泥沉降，选煤厂常常采用添加（）或加倾斜板等手段提高浓缩效果，

A、膨松剂

B、起泡剂

C、絮凝剂

D、催化剂
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