弹簧门梃安装时必须保证:门框安装必须牢同,每边的固定点应不少于( ),且间距不大于1.2m。
A.一处
B.两处
C.0.5m
D.0.7m
参考答案:B
Kathy ______ a lot of Japanese while working with some Japanese engineer.
A.made up
B.took up
C.pick up
D.turned up
据统计,我国唇腭裂男性与女性的比例为()
A.1.0∶1
B.0.7∶1
C.0.5∶1
D.1.5∶1
E.2.0∶1