声波从空气到达内耳淋巴时所衰减的能量为()
A.17DB
B.22DB
C.30DB
D.35DB
E.40DB
参考答案:C
It's on the festival occasions________ the family get together________ he misses his late father.
A.where; that
B.which; when
C.when; that
D.that; when
球根花卉地下部分肥大,发生()。