Our mouth shape makes changes when we pronounce diphthongs.
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The first vowel of a diphthong is as long as the second vowel.
A. 对
B. 错
All diphthongs are voiced.
A. 对
B. 错
地震的破环作用主要表现为三种形式
A.地表破坏
B.人员伤亡
C.次生灾害
D.建筑物的破坏
地表破坏表现为以下哪些形式
A.地裂缝
B.地面下沉
C.喷水冒砂
D.滑坡