递纸牙与压印滚筒叼牙交接时间过长会出现（）故障。
A.套印不准
B.咬口破纸
C.起折
D.剥橡皮
参考答案：B
into many languages, Harry Potter is popular with children and adults as well all over the world.
A．Being translated.
B．Having translated
C．To be translated.
D．Having been translated
工程师可以随时用( )向其助手委派任务和授权，也可以撤销此类委派和授权。
A．汇报形式
B．口头授权
C．命令形式
D．书面形式
