搜题请搜索小程序“爱下问搜题”
问题 填空题

有一只杯子，当用手指蘸水摩擦杯口时，杯子由于______发声．只改变注入杯中的水量，发出声音的______（选填“音调”、“响度”或“音色”）将改变．

答案

用手指蘸水摩擦杯口时，杯子由于振动发声，只改变注入杯中的水量，杯子振动的频率发生变化，音调发生变化，而振幅不变，所以响度不变，音色也不变．

故答案为：振动；音调．

单项选择题

刘某，女性，65岁。心悸头晕，面色不华，倦怠无力，舌质淡红，脉细弱，治疗应选用（）

A.归脾汤

B.安神定志丸

C.四君子汤

D.天王补心丹

E.血府逐瘀汤
查看答案
填空题



China is to send its top negotiator on North Korea’s nuclear program to Pyongyang (36) amid international concern over the launch of (37) .
While the (38) and its ally Japan push for (39) against North Korea, China is (40) , not sanctions.
Also, the (41) to Japan says sanctions on North Korea will (42) efforts to bring the secluded state back to (43) on its nuclear program.
North Korea (44) the six-party talks in (45) after Washington imposed financial sanctions for alleged counterfeiting and (46) activities.
A broadcast on North Korean State Television (47) the missile tests, in what it called a "successful (48) ".
It said North Korea will take action against anyone who (49) them.
The Minister is reported to have told a (50) that the missile launches were (51) because of America’s sanctions against Pyongyang.
North Korea remains (52) in the face of international condemnation and has warned (53) could be carried out.
UN Security Council members will (54) discussions tonight on whether a (55) condemning the missile launches should call for sanctions.
查看答案