游客要求前往不健康的娱乐场所,导游人员应( )。
A.断然拒绝
B.立即报警
C.婉言拒绝
D.耐心劝阻
参考答案:A
It is in the school ______ he studied ten years ago ______ he gave a wonderful speech.
A.that; where
B.where; that
C.where; where
D.that; that
选择()高的煤,防止结焦,可防止链条炉排被掀起或烧坏故障发生。
A、灰分
B、发热量
C、灰熔点
D、水分