复用段保护环环上最大节点数为()个。
A.8
B.16
C.32
D.64
参考答案:B
It is suggested that all these gifts be mailed immediately _________ in time for Christmas.
A.in order to have received
B.so as to receive
C.so as to be received
D.so as to be receiving
煤工作面煤壁到末排支柱()的距离叫控顶距。
A、顶梁处
B、顶梁后端
C、或切顶柱