()固定装置螺栓是离心泵运行时产生振动与噪音的处理方法之一。
A、减少
B、拧松
C、拧紧
D、增加
参考答案:C
阅读短文,根据短文内容判断正误,正确的写"T",错误的写"F"。
Last weekend we played games and went swimming, but we didn't watch TV. My mother cooked our
favourite food and we helped her. We often went for a walk along the beach(海滩).
( ) 1. We watched TV last weekend.
( ) 2. We didn't go for a walk along the beach.
( ) 3. Last weekend we went swimming.
( ) 4. My father cooked our favourite food.
导游人员中止导游活动具备的条件为()。
A.导游活动已经开始尚未结束
B.导游人员擅自中止导游活动
C.造成旅游者无人负责
D.导游人员彻底终止导游活动