土地管理原理可以归纳为四大类，即（）；（）、动态原理、效益原理。
参考答案：人本原理、系统原理
—I remember I left my laptop in the study last night. Why ________ here?
—Oh, I thought you might need it so I brought it here for you.
A．does it come
B．has it come
C．had it come
D．will it come
用干铺卷材作延伸层，干铺卷材的两侧（）处应用玛脂粘贴。
A．10mm
B．30mm
C．40mm，
D．20mm
脂粘贴。