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【单选题】
震动规则,有固定音高的音是
A.
高音
B.
乐音
C.
低音
D.
噪音
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参考答案：
举一反三
【多选题】音高是指声音的高低，它决定于（）
A.
发音体振动的次数
B.
发音体振动的快慢
C.
发音体振动的久暂
D.
发音体在单位时间振动的次数
E.
发音体振动的幅度
【单选题】The Grand Canyon Standing on the rim of the Grand Canyon(大峡谷), gazing across this giant wound in the Earth’’s surface, a visitor might assume that the canyon had been caused by some ancient convulsion...
A.
it was caused by some ancient convulsion
B.
its presence is an embarrassment to the state of Colorado
C.
it looks like an injury on the Earth’s surface
D.
it has caused many visitors to injure themselves
相关题目：
【多选题】音高是指声音的高低，它决定于（）
A.
发音体振动的次数
B.
发音体振动的快慢
C.
发音体振动的久暂
D.
发音体在单位时间振动的次数
E.
发音体振动的幅度
【单选题】The Grand Canyon Standing on the rim of the Grand Canyon(大峡谷), gazing across this giant wound in the Earth’’s surface, a visitor might assume that the canyon had been caused by some ancient convulsion...
A.
it was caused by some ancient convulsion
B.
its presence is an embarrassment to the state of Colorado
C.
it looks like an injury on the Earth’s surface
D.
it has caused many visitors to injure themselves
参考解析：
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