次氯酸钠溶液作为根管冲洗液,最常使用的浓度是()
A.0.5%
B.25%
C.30%
D.5.25%
E.10%~30%
参考答案:D
Simon thought his computer was broken _______ his little brother pointed out that he had forgotten to turn it on.
A.until
B.since
C.after
D.because
WDM光网络中的虚波长通道属()路由算法。
A.分布式
B.集中式
C.时间式
D.空间式