下列不是机械搅拌式浮选机液面翻花的主要原因是（）。A.充气量大且分布不均匀 B.槽
题型：单项选择题
问题：
下列不是机械搅拌式浮选机液面翻花的主要原因是（）。
A.充气量大且分布不均匀
B.槽箱内煤浆循环量过大
C.叶轮与定子的间隙沿圆周不均匀
D.稳流板与导向板错位
题型：单项选择题
to make one just like a police notice. Mr Brown said he was not the police and couldn't use the word
"police". Several days later, Mr Brown made a blue board with white letters.
POLICE NOTICE NO PARKING |
now?" "Really?" he asked.
"Look again," she started to laugh. "You are really clever".
1. Mr Brown's office was _____ his house.
A. next to
B. not far from
C. 2 hours' drive from
D. 5 miles from
2. Mr Brown was angry because _____.
A. he found no room to park his car outside his house
B. he had nothing to eat for lunch at home
C. he lost the way when he drove back home one day
D. he couldn't make a police notice outside his house
3. Mr Brown made _____ notice board (s) altogether (总共).
A. one
B. two
C. three
D. no
4.In the end, Mr Brown made a notice board and it _____.
A. was just the same as a police notice
B. was different in color from a police notice
C. just looked like a police notice
D. said "POLICE NOTICE, NO PARKING"
5. We can infer(推断) that _____ after he put up the blue board.
A. more people will park their cars outside his house
B. more policemen will park their cars outside his house
C. fewer people will park their cars outside his house
D. fewer people will visit him at noon later on