当作者与主要受文者存在不相隶属关系时,只能选取( )。
A.上行文
B.平行文
C.下行文
D.公布性文件
参考答案:B
He came into the classroom _____ a book in his hand. [ ]
A. and
B. with
C. hold
弹簧管压力表指针的角位移为()。
A.5°~10°
B.8°±l°
C.270°
D.180°