第4题: [单项选择]下列哪一个不是投影的要素()。 A. 投射线 B. 投影图 C. 形体 D. 投影面 参考答案:B
第5题: [单项选择]I am sure Tom has been here and has done ______. A. that required him B. which was required of him C. what was required of him D. what has been required him 参考答案:C 答案解析:分析句子可以看出空格处为动词done的宾语部分。what可引导宾语从句,相当于the thing which。其中the thing为has done的宾语,which引导后面的内容作定语。而sth.
第19题: [多项选择]Linux系统中,常见的MTA包括()。 A. Sendmail B. Qmail C. Postfix D. Imap 参考答案:A, B, C
第20题: [单项选择]What is the man going to do A. To see Mary. B. To give a letter to Mary. C. To post the letter. 参考答案:B 答案解析:[听力原文] F: Will you please give this letter to Marry as soon as she comes M: Certainly, I will
第21题: [单项选择]在水泥砂浆中掺入石灰浆的主要目的是()。 A. 提高砂浆的强度 B. 提高砂浆的体积安定性 C. 提高砂浆的可塑性 D. 加快砂浆的凝结速度 参考答案:C 答案解析: