用于根管冲洗剂的过氧化氢溶液浓度是()
A.1%
B.15%
C.2%
D.30%
E.3%
参考答案:E
—Susan didn’t get an invitation to Joe’s wedding ceremony.
— ______ She doesn’t care.
A.What for?
B.How is it?
C.So what?
D.How so?
单向板上局部荷载的有效分布宽度b最接近于()m。
A.3.27
B.2.85
C.2.69
D.0.75