问题
单项选择题
装填催化剂时,应均匀一致,其目的是()。
A、防止床层受力不均匀
B、防止床层被气流吹翻
C、防止床层受热不均
D、防止运行时产生沟流
答案
参考答案:D
装填催化剂时,应均匀一致,其目的是()。
A、防止床层受力不均匀
B、防止床层被气流吹翻
C、防止床层受热不均
D、防止运行时产生沟流
参考答案:D
用方框内所给词组的适当形式填空。 | |
2. Who can help me ______ an English name? 3. The students went out of the classroom ______ as soon as the history class was over. 4. Jenny ______ to jump,but she was lost. 5. Do you ______ to save the rabbit's life? |