按闸门的构造特征分类,可分为平面闸门、()、人字形闸门和其他类型闸门。
A.阀门
B.梁式闸门
C.弧形闸门
D.深水闸门
参考答案:C
It is proposed that the practice of separating students into science and liberal arts classes in senior high schools should be banned. The divided syllabus of liberal arts and science doesn’t conform to the policy of nurturing students with comprehensive abilities.
Topic: Is a divided syllabus reasonable
采煤工作面回风瓦斯传感器的安装位置是距回风眼上口()米。