【单选题】We’ll send you a copy as soon as it becomes _____. We are working on it day and night.
【单选题】to her growing business, Mary has little time to take care of her family.
【判断题】渗碳体的碳量比(C)为6.69%,具有复杂的晶格。它的硬度很高,脆性大,塑性和韧性几乎等于零。
【单选题】一个汉字的机内码需用 ______ 个字节存储。 评析: 机内码是指汉字在计算机中的编码,汉字的机内码占两个字节,分别称为机内码的高位与低位。
【判断题】渗碳体是铁和碳的化合物,其符号为Fe3C,性能特点是硬度高,脆性大,塑性、韧性几乎为零。( )