如果你念拜访别人的话最好提前告知，由于不期的访答并不分是让人高亡的。
You'd better let him know in advance if you'd like to visit someone. Unexpected visits are not always pleasing.
马念杰，高谦。煤巷锚杆支护可靠性设计。煤炭科学基金项目鉴定材料，1997。
Ma Nianjie, Gao Qian. Reliability design of bolt supporting in coal drift. Project Identification Material of coal Science Fnd, 1997.
马念杰，高谦。煤巷锚杆支护可靠性设计。煤炭科学基金项目鉴定材料，1997。
Ma Nianjie, Gao Qian. Reliability design of bolt supporting in coal drift. Project Identification Material of coal Science Fnd, 1997.
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