钢管扣件的基本形式有三种:___,用于连接扣紧两根互相垂直相交的钢管;___用于连接扣紧两根任意角度相交的钢管;___用于钢管的对称接头。
No more having to buy expensive textbooks which you will only use for a year or two and then sell or _______ away.
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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