界址标志的设定时,界标种类有()。
A.石灰界址标桩
B.喷漆界址标志
C.混凝土界址标桩
D.带塑料套的钢钉界址
E.标桩界址标志
参考答案:A, B, C, E
______ giving up, he went on with his research,got his PhD and married the girl.
A.Without
B.Except
C.Instead of
D.But for
速系统的静态特性是由()所决定的。
A.传动放大机构
B.配汽机构
C.感应机构、传动放大机构、配汽机构
D.感应机构