简述钢琴调律工具的种类。
参考答案：
钢琴调律工具有：音叉、调音扳手、中音制音呢条、低音弦塞、高音弦塞、排针、弦槌熨斗、砂纸板等。
用括号内所给词的适当形式填空
1.Thirteen minutes ago,the train_____(leave).
2.The British and the Russians wanted_____( build)the railroad.
3.Would you like_____ ( come) to my party?
4.A lot of_____( foreign) visited our school yesterday.
5.People on Earth_____( watch) Yang Liwei's space flight on TV.
6.The plane landed_____ ( safe) at the airport.
7.Betty_____ ( wave) to his mother and ran to her quickly.
8.Winter_____ (last) from December to February in China.
9.There_____ ( be) no one in the room a moment ago.
10.I listened but_____ ( hear) nothing.
良性高血压的基本病变是
A．细动脉硬化B．细小动脉硬化C．细动脉纤维素样坏死D．增生性小动脉炎和纤维素样坏死
