幼儿园中易发生的传染病的传播途径为()。
A.日常接触传播
B.空气飞沫传播
C.消化道传播
D.血液传播
E.虫媒传播
参考答案:B
Up to now, Hope Project has helped thousands of students who would _____ have dropped out of school. [ ]
A. therefore
B. anyway
C. otherwise
D. nevertheless
混凝土膨胀剂检验的主要物理性能指标有哪些?