换向阀按阀芯的结构形式可分为滑阀式换向阀和()换向阀。
参考答案:转阀式
中国近代前期的近代化进程与欧美国家的近代化相比,主要特点有()。
①受封建保守势力和资本主义列强双重阻碍
②中国近代化一开始是由地主阶级领导,资产阶级始终没有掌握领导权
③中国近代化的推动力主要不是来自内部而是来自外部
④中国工业近代化过程中,地区分布不平衡,部门结构不合理
A.①②③
B.②③④
C.①②③④
D.①③④
I often quarrel about my mother over whether I can watch TV after school. She holds view that senior three students have to make fully use of every minute to work hard at their lessons. It seems to me that once I am allowed to do that, I’ll unable to control myself and forget all about my study. She also thinks it is bad for my eye. But I really can’t accept her ideas. In my opinion, watch TV can set my mind at rest after a day’s hard works. Besides, it is important for us to know what had happened both at home and at abroad. Thus, we shouldn’t be forbidden to watch TV.